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Date: Mon, 18 Sep 2023 20:13:30 +0530
From: Shreeya Patel <shreeya.patel@...labora.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu,
Ricardo Cañuelo <ricardo.canuelo@...labora.com>,
"gustavo.padovan@...labora.com" <gustavo.padovan@...labora.com>,
groeck@...gle.com, zsm@...gle.com, garrick@...gle.com,
Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: [syzbot] INFO: task hung in ext4_fallocate
Hi Everyone,
syzbot has reported a task hung issue in ext4_fallocate, crash report
can be seen at the bottom of the email.
When I tried to reproduce this issue on mainline linux kernel using the
reproducer provided by syzbot, I see an endless loop of following errors :-
[ 89.689751][ T3922] loop1: detected capacity change from 0 to 512
[ 89.690514][ T3916] EXT4-fs error (device loop4):
ext4_map_blocks:577: inode #3: block 9: comm poc: lblock 0 mapped to
illegal pblock 9 (length 1)
[ 89.694709][ T3890] EXT4-fs error (device loop0):
ext4_map_blocks:577: inode #3: block 9: comm poc: lblock 0 mapped to
illegal pblock 9 (length 1)
[ 89.697306][ T3896] EXT4-fs (loop5): 1 orphan inode deleted
[ 89.700797][ T3890] EXT4-fs error (device loop0) in
ext4_reserve_inode_write:5752: Out of memory
[ 89.703072][ T3916] EXT4-fs error (device loop4) in
ext4_reserve_inode_write:5752: Out of memory
[ 89.704703][ T3913] loop3: detected capacity change from 0 to 512
[ 89.706535][ T3896] ext4 filesystem being mounted at
/root/syzkaller.eGkqPu/22/file1 supports timestamps until 2038-01-19
(0x7fffffff)
[ 89.712664][ T3890] EXT4-fs error (device loop0):
ext4_dirty_inode:5956: inode #16: comm poc: mark_inode_dirty error
[ 89.717990][ T3916] EXT4-fs error (device loop4):
ext4_dirty_inode:5956: inode #16: comm poc: mark_inode_dirty error
[ 89.720967][ T3890] EXT4-fs error (device loop0) in
ext4_reserve_inode_write:5752: Out of memory
[ 89.725410][ T3916] EXT4-fs error (device loop4):
ext4_map_blocks:577: inode #3: block 9: comm poc: lblock 0 mapped to
illegal pblock 9 (length 1)
[ 89.732045][ T3896] EXT4-fs error (device loop5):
ext4_map_blocks:577: inode #3: block 9: comm poc: lblock 0 mapped to
illegal pblock 9 (length 1)
[ 89.752554][ T3890] EXT4-fs error (device loop0):
ext4_alloc_file_blocks:4468: inode #16: comm poc: mark_inode_dirty error
Same is seen with the LTS and chromeOS 5.10, 5.15 kernel. In case I add
some debugging statements in the ext4_fallocate function, they are all
printed endlessly too.
I am not sure if an infinite loop is also termed as task hung but it
would be great if someone expert in fixing filesystem issues take a look
into this.
I am attaching the reproducer and config file in case anyone wants to
test it locally.
Please reach out in case you need any additional details to reproduce this.
Thanks,
Shreeya Patel
#regzbot introduced: v6.6-rc1..
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
syzbot report :-
(A) The crash report from June 15, 2023:
INFO: task syz-executor319:5195 blocked for more than 143 seconds.
Not tainted 5.10.184-syzkaller-22756-g4d841d608c1b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor319 state:D stack: 0 pid: 5195 ppid: 2015 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
rwsem_down_write_slowpath+0x4e3/0x867 kernel/locking/rwsem.c:1235
__down_write+0x99/0xd0 kernel/locking/rwsem.c:1401
inode_lock include/linux/fs.h:776 [inline]
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
vfs_fallocate+0x5a6/0x687 fs/open.c:312
ksys_fallocate+0x5a/0x8c fs/open.c:335
__do_sys_fallocate fs/open.c:343 [inline]
__se_sys_fallocate fs/open.c:341 [inline]
__x64_sys_fallocate+0xa7/0xb0 fs/open.c:341
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9c092f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb2b20c67b0 RCX: 00007fb2b203f0c9
RDX: 0000000000008947 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67b8
Showing all locks held in the system:
1 lock held by khungtaskd/839:
#0: ffffffff86cc1720 (rcu_read_lock){....}-{1:2}, at: rcu_lock_release
include/linux/rcupdate.h:271 [inline]
#0: ffffffff86cc1720 (rcu_read_lock){....}-{1:2}, at:
rcu_lock_acquire.constprop.0+0x0/0x22 include/linux/rcupdate.h:720
2 locks held by getty/1961:
#0: ffff88810ec85098 (&tty->ldisc_sem){++++}-{0:0}, at:
tty_ldisc_ref_wait+0x22/0x6a drivers/tty/tty_ldisc.c:267
#1: ffffc900000532e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at:
n_tty_read+0x599/0xed7 drivers/tty/n_tty.c:2209
1 lock held by syz-executor319/2018:
1 lock held by syz-executor319/2019:
1 lock held by udevd/2036:
2 locks held by kworker/u4:4/3020:
#0: ffff888100071138 ((wq_completion)events_unbound){+.+.}-{0:0}, at:
process_one_work+0x4fe/0xad5 kernel/workqueue.c:2250
#1: ffff8881f6b27908 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0},
at: write_seqcount_t_begin include/linux/seqlock.h:541 [inline]
#1: ffff8881f6b27908 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0},
at: psi_group_change+0xa6/0x676 kernel/sched/psi.c:711
3 locks held by kworker/1:5/4866:
#0: ffff888100052938 ((wq_completion)events){+.+.}-{0:0}, at:
process_one_work+0x4fe/0xad5 kernel/workqueue.c:2250
#1: ffffc90006ec7df0
((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at:
process_one_work+0x544/0xad5 kernel/workqueue.c:2254
#2: ffffffff86cc9ae8 (rcu_state.exp_mutex){+.+.}-{3:3}, at:
exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#2: ffffffff86cc9ae8 (rcu_state.exp_mutex){+.+.}-{3:3}, at:
synchronize_rcu_expedited+0x238/0x4fd kernel/rcu/tree_exp.h:841
7 locks held by syz-executor319/5177:
2 locks held by syz-executor319/5195:
#0: ffff888119b6c450 (sb_writers#5){.+.+}-{0:0}, at: __sb_start_write
include/linux/fs.h:1651 [inline]
#0: ffff888119b6c450 (sb_writers#5){.+.+}-{0:0}, at: sb_start_write
include/linux/fs.h:1721 [inline]
#0: ffff888119b6c450 (sb_writers#5){.+.+}-{0:0}, at: file_start_write
include/linux/fs.h:2855 [inline]
#0: ffff888119b6c450 (sb_writers#5){.+.+}-{0:0}, at:
vfs_fallocate+0x547/0x687 fs/open.c:311
#1:
ffff88811f7cc058
(
&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock
include/linux/fs.h:776 [inline]
&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_fallocate+0x181/0x255e
fs/ext4/extents.c:4697
4 locks held by syz-executor319/8626:
#0:
ffff88810e02e450
(
sb_writers
#5
){.+.+}-{0:0}
, at: __sb_start_write include/linux/fs.h:1651 [inline]
, at: sb_start_write include/linux/fs.h:1721 [inline]
, at: mnt_want_write+0x3e/0x97 fs/namespace.c:355
#1: ffff88811f8cf230 (&sb->s_type->i_mutex_key#8
){++++}-{3:3}, at: inode_lock include/linux/fs.h:776 [inline]
){++++}-{3:3}, at: do_truncate+0x13d/0x1c9 fs/open.c:65
#2: ffff88811f8cf0b8 (
&ei->i_mmap_sem){++++}-{3:3}, at: ext4_setattr+0xcc3/0x1752
fs/ext4/inode.c:5561
#3:
ffff88811f8cf020 (&ei->i_data_sem){++++}-{3:3}, at:
ext4_truncate+0x761/0xb6a fs/ext4/inode.c:4353
2 locks held by syz-executor319/8633:
#0: ffff88810e02e450 (sb_writers#5){.+.+}-{0:0}, at: __sb_start_write
include/linux/fs.h:1651 [inline]
#0: ffff88810e02e450 (sb_writers#5){.+.+}-{0:0}, at: sb_start_write
include/linux/fs.h:1721 [inline]
#0: ffff88810e02e450 (sb_writers#5){.+.+}-{0:0}, at: file_start_write
include/linux/fs.h:2855 [inline]
#0: ffff88810e02e450 (sb_writers#5){.+.+}-{0:0}, at:
vfs_fallocate+0x547/0x687 fs/open.c:311
#1: ffff88811f8cf230 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
inode_lock include/linux/fs.h:776 [inline]
#1: ffff88811f8cf230 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
4 locks held by syz-executor319/8677:
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at: __sb_start_write
include/linux/fs.h:1651 [inline]
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at: sb_start_write
include/linux/fs.h:1721 [inline]
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at:
mnt_want_write+0x3e/0x97 fs/namespace.c:355
#1: ffff88811f9f8e80 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
inode_lock include/linux/fs.h:776 [inline]
#1: ffff88811f9f8e80 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
do_truncate+0x13d/0x1c9 fs/open.c:65
#2: ffff88811f9f8d08 (&ei->i_mmap_sem){++++}-{3:3}, at:
ext4_setattr+0xcc3/0x1752 fs/ext4/inode.c:5561
#3: ffff88811f9f8c70 (&ei->i_data_sem){++++}-{3:3}, at:
ext4_truncate+0x761/0xb6a fs/ext4/inode.c:4353
2 locks held by syz-executor319/8687:
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at: __sb_start_write
include/linux/fs.h:1651 [inline]
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at: sb_start_write
include/linux/fs.h:1721 [inline]
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at: file_start_write
include/linux/fs.h:2855 [inline]
#0: ffff88810ec98450 (sb_writers#5){.+.+}-{0:0}, at:
vfs_fallocate+0x547/0x687 fs/open.c:311
#1: ffff88811f9f8e80 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
inode_lock include/linux/fs.h:776 [inline]
#1: ffff88811f9f8e80 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
2 locks held by udevd/8902:
#0: ffff888106438080 (&bdev->bd_mutex){+.+.}-{3:3}, at:
__blkdev_put+0x101/0x500 fs/block_dev.c:1793
#1: ffffffff8740b8a8 (loop_ctl_mutex){+.+.}-{3:3}, at:
__loop_clr_fd+0x8d/0x913 drivers/block/loop.c:1207
4 locks held by syz-executor319/11374:
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at: __sb_start_write
include/linux/fs.h:1651 [inline]
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at: sb_start_write
include/linux/fs.h:1721 [inline]
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at:
mnt_want_write+0x3e/0x97 fs/namespace.c:355
#1: ffff88811facde40 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
inode_lock include/linux/fs.h:776 [inline]
#1: ffff88811facde40 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
do_truncate+0x13d/0x1c9 fs/open.c:65
#2: ffff88811facdcc8 (&ei->i_mmap_sem){++++}-{3:3}, at:
ext4_setattr+0xcc3/0x1752 fs/ext4/inode.c:5561
#3: ffff88811facdc30 (&ei->i_data_sem){++++}-{3:3}, at:
ext4_truncate+0x761/0xb6a fs/ext4/inode.c:4353
2 locks held by syz-executor319/11384:
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at: __sb_start_write
include/linux/fs.h:1651 [inline]
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at: sb_start_write
include/linux/fs.h:1721 [inline]
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at: file_start_write
include/linux/fs.h:2855 [inline]
#0: ffff888105f16450 (sb_writers#5){.+.+}-{0:0}, at:
vfs_fallocate+0x547/0x687 fs/open.c:311
#1: ffff88811facde40 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
inode_lock include/linux/fs.h:776 [inline]
#1: ffff88811facde40 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at:
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
2 locks held by syz-executor319/12502:
#0: ffff88810643ef00 (&bdev->bd_mutex){+.+.}-{3:3}, at:
__blkdev_get+0x21f/0xd64 fs/block_dev.c:1503
#1: ffffffff8740b8a8 (loop_ctl_mutex){+.+.}-{3:3}, at: lo_open+0x19/0xc6
drivers/block/loop.c:1890
1 lock held by syz-executor319/12503:
#0: ffff888106438080 (&bdev->bd_mutex){+.+.}-{3:3}, at:
__blkdev_get+0x21f/0xd64 fs/block_dev.c:1503
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 839 Comm: khungtaskd Not tainted
5.10.184-syzkaller-22756-g4d841d608c1b #0
809c46235bb373ae9b9e9418415172972c181155
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 05/27/2023
Call Trace:
__dump_stack lib/dump_stack.c:86 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:127
nmi_cpu_backtrace+0x11f/0x13d lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0xd1/0x1b4 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:159 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
watchdog+0xa64/0xaef kernel/hung_task.c:296
kthread+0x346/0x35a kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11374 Comm: syz-executor319 Not tainted
5.10.184-syzkaller-22756-g4d841d608c1b #0
809c46235bb373ae9b9e9418415172972c181155
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 05/27/2023
RIP: 0010:test_bit+0x28/0x2e
include/asm-generic/bitops/instrumented-non-atomic.h:136
Code: 5d c3 48 89 f8 b9 40 00 00 00 55 48 89 f5 48 99 53 48 89 fb 48 f7
f9 48 8d 3c c6 be 08 00 00 00 e8 b1 c8 3a 00 48 0f a3 5d 00 <5b> 0f 92
c0 5d c3 41 57 41 56 41 89 d6 41 55 49 89 f5 41 54 55 8d
RSP: 0018:ffffc900057a6990 EFLAGS: 00000047
RAX: fffffbfff0fa9701 RBX: 0000000000000001 RCX: fffffbfff0fa9800
RDX: fffffbfff0fa9800 RSI: 0000000000000008 RDI: ffffffff87d4bff8
RBP: ffffffff87d4bff8 R08: fffffbfff0fa9800 R09: ffffffff87d4bfff
R10: 0000000000000000 R11: ffffffff813918e5 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fb2b1fea700(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb2a9c09000 CR3: 00000001198fd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
cpumask_test_cpu.constprop.0+0x15/0x19 include/linux/cpumask.h:367
trace_lock_acquire include/trace/events/lock.h:13 [inline]
lock_acquire+0x11e/0x3b7 kernel/locking/lockdep.c:5537
write_seqcount_t_begin_nested.constprop.0+0x42/0x45
include/linux/seqlock.h:515
write_seqcount_t_begin include/linux/seqlock.h:541 [inline]
psi_group_change+0xa6/0x676 kernel/sched/psi.c:711
psi_task_change+0x143/0x17a kernel/sched/psi.c:812
psi_enqueue kernel/sched/stats.h:82 [inline]
enqueue_task+0x1c4/0x242 kernel/sched/core.c:1942
activate_task+0x50/0x81 kernel/sched/core.c:1974
ttwu_do_activate+0x161/0x17c kernel/sched/core.c:2892
ttwu_queue kernel/sched/core.c:3089 [inline]
try_to_wake_up+0x5a7/0x9e6 kernel/sched/core.c:3367
wake_up_worker+0x70/0x77 kernel/workqueue.c:838
insert_work+0xc7/0xd4 kernel/workqueue.c:1353
__queue_work+0x99e/0x9e1 kernel/workqueue.c:1504
__queue_delayed_work+0xf7/0x1ef kernel/workqueue.c:1651
mod_delayed_work_on+0xb9/0x138 kernel/workqueue.c:1725
kblockd_mod_delayed_work_on+0x2a/0x33 block/blk-core.c:1660
blk_mq_add_to_requeue_list+0x14c/0x15f block/blk-mq.c:844
blk_flush_queue_rq block/blk-flush.c:137 [inline]
blk_flush_complete_seq+0x184/0x851 block/blk-flush.c:192
blk_insert_flush+0x3c7/0x3dc block/blk-flush.c:443
blk_mq_submit_bio+0xa78/0xfb7 block/blk-mq.c:2207
__submit_bio_noacct_mq block/blk-core.c:1017 [inline]
submit_bio_noacct+0x2a3/0x6fe block/blk-core.c:1050
submit_bio+0x457/0x4a8 block/blk-core.c:1120
submit_bh_wbc+0x604/0x615 fs/buffer.c:3054
__sync_dirty_buffer+0x110/0x189 fs/buffer.c:3155
ext4_commit_super+0x8f1/0x98d fs/ext4/super.c:5569
save_error_info+0x93/0x9e fs/ext4/super.c:628
__ext4_std_error+0x1f9/0x242 fs/ext4/super.c:841
ext4_reserve_inode_write+0x188/0x19b fs/ext4/inode.c:5889
__ext4_mark_inode_dirty+0x251/0x5b6 fs/ext4/inode.c:6055
__ext4_ext_dirty+0x160/0x177 fs/ext4/extents.c:182
ext4_ext_remove_space+0x2984/0x2a32 fs/ext4/extents.c:3056
ext4_ext_truncate+0x1ab/0x1f7 fs/ext4/extents.c:4413
ext4_truncate+0x7a2/0xb6a fs/ext4/inode.c:4358
ext4_setattr+0x15c1/0x1752 fs/ext4/inode.c:5638
notify_change+0xb57/0xdf2 fs/attr.c:394
do_truncate+0x14c/0x1c9 fs/open.c:67
handle_truncate fs/namei.c:3066 [inline]
do_open fs/namei.c:3407 [inline]
path_openat+0x1933/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 15 00 00 90 48 89 f8 48 89
f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb2b1fea2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb2b20c67a0 RCX: 00007fb2b203f0c9
RDX: 0000000000000000 RSI: 000000000014d27e RDI: 0000000020000180
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67a8
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run:
3.489 msecs
task:udevd state:D stack: 0 pid: 2036 ppid: 1881 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_preempt_disabled+0xf/0x1a kernel/sched/core.c:5545
__mutex_lock_common kernel/locking/mutex.c:1047 [inline]
__mutex_lock+0x37c/0x690 kernel/locking/mutex.c:1109
__blkdev_get+0x21f/0xd64 fs/block_dev.c:1503
blkdev_get+0xcc/0x1eb fs/block_dev.c:1658
blkdev_open+0x22e/0x247 fs/block_dev.c:1775
do_dentry_open+0x6e5/0xbe3 fs/open.c:820
do_open fs/namei.c:3403 [inline]
path_openat+0x1689/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x795ff25609a4
RSP: 002b:00007ffe1ab3aa50 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00005a7b436ff460 RCX: 0000795ff25609a4
RDX: 00000000000a0800 RSI: 00005a7b436f7c90 RDI: 00000000ffffff9c
RBP: 00005a7b436f7c90 R08: 00000000ffffffff R09: 00007ffe1ab55080
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 00005a7b436f3a30 R14: 0000000000000001 R15: 00005a7b436ca2c0
task:syz-executor319 state:D stack: 0 pid: 5177 ppid: 2015 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_timeout+0x16a/0x1fc kernel/time/timer.c:2148
io_schedule_timeout+0x25/0x70 kernel/sched/core.c:7147
congestion_wait+0x108/0x2e3 mm/backing-dev.c:978
ext4_ext_truncate+0x1e4/0x1f7 fs/ext4/extents.c:4416
ext4_truncate+0x7a2/0xb6a fs/ext4/inode.c:4358
ext4_setattr+0x15c1/0x1752 fs/ext4/inode.c:5638
notify_change+0xb57/0xdf2 fs/attr.c:394
do_truncate+0x14c/0x1c9 fs/open.c:67
handle_truncate fs/namei.c:3066 [inline]
do_open fs/namei.c:3407 [inline]
path_openat+0x1933/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2b1fea2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb2b20c67a0 RCX: 00007fb2b203f0c9
RDX: 0000000000000000 RSI: 000000000014d27e RDI: 0000000020000180
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000004ae R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67a8
task:syz-executor319 state:D stack: 0 pid: 5195 ppid: 2015 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
rwsem_down_write_slowpath+0x4e3/0x867 kernel/locking/rwsem.c:1235
__down_write+0x99/0xd0 kernel/locking/rwsem.c:1401
inode_lock include/linux/fs.h:776 [inline]
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
vfs_fallocate+0x5a6/0x687 fs/open.c:312
ksys_fallocate+0x5a/0x8c fs/open.c:335
__do_sys_fallocate fs/open.c:343 [inline]
__se_sys_fallocate fs/open.c:341 [inline]
__x64_sys_fallocate+0xa7/0xb0 fs/open.c:341
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9c092f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb2b20c67b0 RCX: 00007fb2b203f0c9
RDX: 0000000000008947 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67b8
task:syz-executor319 state:D stack: 0 pid: 8626 ppid: 2021 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock_irq+0x3a/0x3c kernel/locking/spinlock.c:199
task:syz-executor319 state:D stack: 0 pid: 8633 ppid: 2021 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
rwsem_down_write_slowpath+0x4e3/0x867 kernel/locking/rwsem.c:1235
__down_write+0x99/0xd0 kernel/locking/rwsem.c:1401
inode_lock include/linux/fs.h:776 [inline]
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
vfs_fallocate+0x5a6/0x687 fs/open.c:312
ksys_fallocate+0x5a/0x8c fs/open.c:335
__do_sys_fallocate fs/open.c:343 [inline]
__se_sys_fallocate fs/open.c:341 [inline]
__x64_sys_fallocate+0xa7/0xb0 fs/open.c:341
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9c092f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb2b20c67b0 RCX: 00007fb2b203f0c9
RDX: 0000000000008947 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67b8
task:syz-executor319 state:D stack: 0 pid: 8677 ppid: 2020 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_timeout+0x16a/0x1fc kernel/time/timer.c:2148
io_schedule_timeout+0x25/0x70 kernel/sched/core.c:7147
congestion_wait+0x108/0x2e3 mm/backing-dev.c:978
ext4_ext_truncate+0x1e4/0x1f7 fs/ext4/extents.c:4416
ext4_truncate+0x7a2/0xb6a fs/ext4/inode.c:4358
ext4_setattr+0x15c1/0x1752 fs/ext4/inode.c:5638
notify_change+0xb57/0xdf2 fs/attr.c:394
do_truncate+0x14c/0x1c9 fs/open.c:67
handle_truncate fs/namei.c:3066 [inline]
do_open fs/namei.c:3407 [inline]
path_openat+0x1933/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2b1fea2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb2b20c67a0 RCX: 00007fb2b203f0c9
RDX: 0000000000000000 RSI: 000000000014d27e RDI: 0000000020000180
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000004ae R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67a8
task:syz-executor319 state:D stack: 0 pid: 8687 ppid: 2020 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
rwsem_down_write_slowpath+0x4e3/0x867 kernel/locking/rwsem.c:1235
__down_write+0x99/0xd0 kernel/locking/rwsem.c:1401
inode_lock include/linux/fs.h:776 [inline]
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
vfs_fallocate+0x5a6/0x687 fs/open.c:312
ksys_fallocate+0x5a/0x8c fs/open.c:335
__do_sys_fallocate fs/open.c:343 [inline]
__se_sys_fallocate fs/open.c:341 [inline]
__x64_sys_fallocate+0xa7/0xb0 fs/open.c:341
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9c092f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb2b20c67b0 RCX: 00007fb2b203f0c9
RDX: 0000000000008947 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67b8
task:udevd state:D stack: 0 pid: 8902 ppid: 1881 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_preempt_disabled+0xf/0x1a kernel/sched/core.c:5545
__mutex_lock_common kernel/locking/mutex.c:1047 [inline]
__mutex_lock+0x37c/0x690 kernel/locking/mutex.c:1109
__blkdev_get+0x21f/0xd64 fs/block_dev.c:1503
blkdev_get+0xcc/0x1eb fs/block_dev.c:1658
blkdev_open+0x22e/0x247 fs/block_dev.c:1775
do_dentry_open+0x6e5/0xbe3 fs/open.c:820
do_open fs/namei.c:3403 [inline]
path_openat+0x1689/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x795ff25609a4
RSP: 002b:00007ffe1ab35650 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000795ff25609a4
RDX: 0000000000080000 RSI: 00005a7b436f4250 RDI: 00000000ffffff9c
RBP: 00005a7b436f4250 R08: 00005a7b43703070 R09: 0000795ff263bc10
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 00005a7b43703070 R14: 0000000000000000 R15: 0000000000000001
task:syz-executor319 state:D stack: 0 pid:11374 ppid: 2017 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_timeout+0x16a/0x1fc kernel/time/timer.c:2148
io_schedule_timeout+0x25/0x70 kernel/sched/core.c:7147
congestion_wait+0x108/0x2e3 mm/backing-dev.c:978
ext4_ext_truncate+0x1e4/0x1f7 fs/ext4/extents.c:4416
ext4_truncate+0x7a2/0xb6a fs/ext4/inode.c:4358
ext4_setattr+0x15c1/0x1752 fs/ext4/inode.c:5638
notify_change+0xb57/0xdf2 fs/attr.c:394
do_truncate+0x14c/0x1c9 fs/open.c:67
handle_truncate fs/namei.c:3066 [inline]
do_open fs/namei.c:3407 [inline]
path_openat+0x1933/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2b1fea2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb2b20c67a0 RCX: 00007fb2b203f0c9
RDX: 0000000000000000 RSI: 000000000014d27e RDI: 0000000020000180
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67a8
task:syz-executor319 state:D
stack: 0 pid:11384 ppid: 2017 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
rwsem_down_write_slowpath+0x4e3/0x867 kernel/locking/rwsem.c:1235
__down_write+0x99/0xd0 kernel/locking/rwsem.c:1401
inode_lock include/linux/fs.h:776 [inline]
ext4_fallocate+0x181/0x255e fs/ext4/extents.c:4697
vfs_fallocate+0x5a6/0x687 fs/open.c:312
ksys_fallocate+0x5a/0x8c fs/open.c:335
__do_sys_fallocate fs/open.c:343 [inline]
__se_sys_fallocate fs/open.c:341 [inline]
__x64_sys_fallocate+0xa7/0xb0 fs/open.c:341
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9c092f8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb2b20c67b0 RCX: 00007fb2b203f0c9
RDX: 0000000000008947 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67b8
task:syz-executor319 state:D stack: 0 pid:12502 ppid: 2018 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
blk_mq_freeze_queue_wait+0xf7/0x14e block/blk-mq.c:150
__loop_clr_fd+0x224/0x913 drivers/block/loop.c:1223
lo_release+0x11b/0x1af drivers/block/loop.c:1923
__blkdev_put+0x38a/0x500 fs/block_dev.c:1806
blkdev_close+0x9a/0x9f fs/block_dev.c:1875
__fput+0x418/0x729 fs/file_table.c:281
task_work_run+0x12b/0x15b kernel/task_work.c:161
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:173 [inline]
exit_to_user_mode_prepare+0xbf/0x160 kernel/entry/common.c:200
syscall_exit_to_user_mode+0x128/0x168 kernel/entry/common.c:276
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b1ffb4eb
RSP: 002b:00007fb2b1fea150 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fb2b1ffb4eb
RDX: 0000000000000010 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 00000000000004ae
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb2b1fea6b8
R13: 00007fb2b1fea180 R14: 00007fb2b1fea1c0 R15: 0000000000004500
task:syz-executor319 state:D stack: 0 pid:12504 ppid: 2018 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_preempt_disabled+0xf/0x1a kernel/sched/core.c:5545
__mutex_lock_common kernel/locking/mutex.c:1047 [inline]
__mutex_lock+0x37c/0x690 kernel/locking/mutex.c:1109
__blkdev_get+0x21f/0xd64 fs/block_dev.c:1503
blkdev_get+0xcc/0x1eb fs/block_dev.c:1658
blkdev_open+0x22e/0x247 fs/block_dev.c:1775
do_dentry_open+0x6e5/0xbe3 fs/open.c:820
do_open fs/namei.c:3403 [inline]
path_openat+0x1689/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9c092f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb2b20c67b0 RCX: 00007fb2b203f0c9
RDX: 0000000000000000 RSI: 000000000014113e RDI: 00000000200000c0
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67b8
task:syz-executor319 state:D stack: 0 pid:12508 ppid: 2019 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:4197 [inline]
__schedule+0x210d/0x21ae kernel/sched/core.c:5408
schedule+0x168/0x1cc kernel/sched/core.c:5486
schedule_preempt_disabled+0xf/0x1a kernel/sched/core.c:5545
__mutex_lock_common kernel/locking/mutex.c:1047 [inline]
__mutex_lock+0x37c/0x690 kernel/locking/mutex.c:1109
__blkdev_get+0x21f/0xd64 fs/block_dev.c:1503
blkdev_get+0xcc/0x1eb fs/block_dev.c:1658
blkdev_open+0x22e/0x247 fs/block_dev.c:1775
do_dentry_open+0x6e5/0xbe3 fs/open.c:820
do_open fs/namei.c:3403 [inline]
path_openat+0x1689/0x197a fs/namei.c:3521
do_filp_open+0xc2/0x156 fs/namei.c:3548
do_sys_openat2+0x113/0x36a fs/open.c:1189
do_sys_open+0x8d/0xc1 fs/open.c:1206
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:51
entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fb2b203f0c9
RSP: 002b:00007fb2a9be82f8 EFLAGS: 00000246
ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fb2b20c67c0 RCX: 00007fb2b203f0c9
RDX: 0000000000000000 RSI: 000000000014113e RDI: 00000000200000c0
RBP: 00007fb2b20927bc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb2b20917b8
R13: 0031656c69662f2e R14: 6f6f6c2f7665642f R15: 00007fb2b20c67c8
View attachment "reproducer.c" of type "text/x-csrc" (56265 bytes)
View attachment "config" of type "text/plain" (203239 bytes)
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