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Message-ID: <000000000000e8a6f705d3afe604@google.com>
Date: Tue, 21 Dec 2021 14:55:30 -0800
From: syzbot <syzbot+72c5cf124089bc318016@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] INFO: task hung in filename_create (4)
Hello,
syzbot found the following issue on:
HEAD commit: 6441998e2e37 Merge tag 'audit-pr-20211216' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12b88443b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa556098924b78f0
dashboard link: https://syzkaller.appspot.com/bug?extid=72c5cf124089bc318016
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160d179db00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17741243b00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+72c5cf124089bc318016@...kaller.appspotmail.com
INFO: task syz-executor149:3707 blocked for more than 143 seconds.
Not tainted 5.16.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor149 state:D stack:23928 pid: 3707 ppid: 3685 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:4972 [inline]
context_switch kernel/sched/core.c:4972 [inline] kernel/sched/core.c:6253
__schedule+0xa9a/0x4940 kernel/sched/core.c:6253 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326 kernel/sched/core.c:6326
rwsem_down_write_slowpath+0x634/0x1110 kernel/locking/rwsem.c:1151 kernel/locking/rwsem.c:1151
__down_write_common kernel/locking/rwsem.c:1268 [inline]
__down_write_common kernel/locking/rwsem.c:1265 [inline]
__down_write kernel/locking/rwsem.c:1277 [inline]
__down_write_common kernel/locking/rwsem.c:1268 [inline] kernel/locking/rwsem.c:1634
__down_write_common kernel/locking/rwsem.c:1265 [inline] kernel/locking/rwsem.c:1634
__down_write kernel/locking/rwsem.c:1277 [inline] kernel/locking/rwsem.c:1634
down_write_nested+0x139/0x150 kernel/locking/rwsem.c:1634 kernel/locking/rwsem.c:1634
inode_lock_nested include/linux/fs.h:818 [inline]
inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654
filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654
do_mkdirat+0x94/0x300 fs/namei.c:3898 fs/namei.c:3898
__do_sys_mkdir fs/namei.c:3929 [inline]
__se_sys_mkdir fs/namei.c:3927 [inline]
__do_sys_mkdir fs/namei.c:3929 [inline] fs/namei.c:3927
__se_sys_mkdir fs/namei.c:3927 [inline] fs/namei.c:3927
__x64_sys_mkdir+0xf2/0x140 fs/namei.c:3927 fs/namei.c:3927
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8e02ef3b47
RSP: 002b:00007f8e03098ca8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e02ef3b47
RDX: 00007f8e03098cf3 RSI: 00000000000001ff RDI: 00007f8e03098ce0
RBP: 00007f8e03098ee0 R08: 0000000000000000 R09: 00007f8e03098b40
R10: 00007f8e030989f7 R11: 0000000000000202 R12: 0000000000000001
R13: 00007f8e03098ce0 R14: 00007f8e03098d20 R15: 00007f8e03098ef0
</TASK>
INFO: task syz-executor149:3711 blocked for more than 143 seconds.
Not tainted 5.16.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor149 state:D stack:23928 pid: 3711 ppid: 3681 flags:0x00000000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:4972 [inline]
context_switch kernel/sched/core.c:4972 [inline] kernel/sched/core.c:6253
__schedule+0xa9a/0x4940 kernel/sched/core.c:6253 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326 kernel/sched/core.c:6326
rwsem_down_write_slowpath+0x634/0x1110 kernel/locking/rwsem.c:1151 kernel/locking/rwsem.c:1151
__down_write_common kernel/locking/rwsem.c:1268 [inline]
__down_write_common kernel/locking/rwsem.c:1265 [inline]
__down_write kernel/locking/rwsem.c:1277 [inline]
__down_write_common kernel/locking/rwsem.c:1268 [inline] kernel/locking/rwsem.c:1634
__down_write_common kernel/locking/rwsem.c:1265 [inline] kernel/locking/rwsem.c:1634
__down_write kernel/locking/rwsem.c:1277 [inline] kernel/locking/rwsem.c:1634
down_write_nested+0x139/0x150 kernel/locking/rwsem.c:1634 kernel/locking/rwsem.c:1634
inode_lock_nested include/linux/fs.h:818 [inline]
inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654
filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654
do_mkdirat+0x94/0x300 fs/namei.c:3898 fs/namei.c:3898
__do_sys_mkdir fs/namei.c:3929 [inline]
__se_sys_mkdir fs/namei.c:3927 [inline]
__do_sys_mkdir fs/namei.c:3929 [inline] fs/namei.c:3927
__se_sys_mkdir fs/namei.c:3927 [inline] fs/namei.c:3927
__x64_sys_mkdir+0xf2/0x140 fs/namei.c:3927 fs/namei.c:3927
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8e02ef3b47
RSP: 002b:00007f8e03098ca8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e02ef3b47
RDX: 00007f8e03098cf3 RSI: 00000000000001ff RDI: 00007f8e03098ce0
RBP: 00007f8e03098ee0 R08: 0000000000000000 R09: 00007f8e03098b40
R10: 00007f8e030989f7 R11: 0000000000000202 R12: 0000000000000001
R13: 00007f8e03098ce0 R14: 00007f8e03098d20 R15: 00007f8e03098ef0
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/26:
#0: ffffffff8bb83de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 kernel/locking/lockdep.c:6458
2 locks held by kworker/u4:4/995:
#0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 kernel/sched/core.c:478
#1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880 kernel/sched/psi.c:880
2 locks held by kworker/1:3/3266:
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] kernel/workqueue.c:2269
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] kernel/workqueue.c:2269
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] kernel/workqueue.c:2269
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] kernel/workqueue.c:2269
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] kernel/workqueue.c:2269
#0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 kernel/workqueue.c:2269
#1: ffffc90001a6fdb0 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 kernel/workqueue.c:2273
2 locks held by getty/3279:
#0: ffff8880231c5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 drivers/tty/tty_ldisc.c:252
#1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 drivers/tty/n_tty.c:2113
1 lock held by syz-executor149/3706:
#0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] kernel/rcu/tree_exp.h:836
#0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d5/0x620 kernel/rcu/tree_exp.h:836 kernel/rcu/tree_exp.h:836
2 locks held by syz-executor149/3707:
#0: ffff88801f07a460 (sb_writers#11){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 fs/namei.c:3649
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline]
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654
1 lock held by syz-executor149/3708:
#0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] kernel/rcu/tree_exp.h:836
#0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d5/0x620 kernel/rcu/tree_exp.h:836 kernel/rcu/tree_exp.h:836
2 locks held by syz-executor149/3709:
#0: ffff88801f07a460 (sb_writers#11){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 fs/namei.c:3649
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline]
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654
2 locks held by syz-executor149/3711:
#0: ffff88801f07a460 (sb_writers#11){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 fs/namei.c:3649
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline]
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654
#1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
__dump_stack lib/dump_stack.c:88 [inline] lib/dump_stack.c:106
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] kernel/hung_task.c:295
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] kernel/hung_task.c:295
watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kernel/hung_task.c:295
kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:validate_chain kernel/locking/lockdep.c:3808 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3808 [inline] kernel/locking/lockdep.c:5027
RIP: 0010:__lock_acquire+0xcaa/0x54a0 kernel/locking/lockdep.c:5027 kernel/locking/lockdep.c:5027
Code: ff df 0f b6 04 02 49 89 cf 84 c0 74 08 3c 03 0f 8e 2b 34 00 00 41 8b 44 24 20 25 00 80 04 00 3d 00 00 04 00 0f 84 5e 09 00 00 <48> c7 c2 8c 6a 91 8d 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f
RSP: 0018:ffffc90000cd7a60 EFLAGS: 00000087
RAX: 0000000000000000 RBX: 00000000a623e6fc RCX: eeae28e815dd6c6b
RDX: 1ffff110021cec3a RSI: 000000004cd55dcb RDI: ffffffff8ff76c60
RBP: 0000000000000004 R08: 0000000000000000 R09: ffffffff8ff74a07
R10: fffffbfff1fee940 R11: 0000000000000000 R12: ffff888010e761b0
R13: ffff888010e75700 R14: 0000000000000000 R15: eeae28e815dd6c6b
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555840848 CR3: 000000000b88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602
rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
rcu_read_lock include/linux/rcupdate.h:688 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
rcu_lock_acquire include/linux/rcupdate.h:268 [inline] net/batman-adv/network-coding.c:723
rcu_read_lock include/linux/rcupdate.h:688 [inline] net/batman-adv/network-coding.c:723
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] net/batman-adv/network-coding.c:723
batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:723 net/batman-adv/network-coding.c:723
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295
</TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
0: df 0f fisttps (%rdi)
2: b6 04 mov $0x4,%dh
4: 02 49 89 add -0x77(%rcx),%cl
7: cf iret
8: 84 c0 test %al,%al
a: 74 08 je 0x14
c: 3c 03 cmp $0x3,%al
e: 0f 8e 2b 34 00 00 jle 0x343f
14: 41 8b 44 24 20 mov 0x20(%r12),%eax
19: 25 00 80 04 00 and $0x48000,%eax
1e: 3d 00 00 04 00 cmp $0x40000,%eax
23: 0f 84 5e 09 00 00 je 0x987
* 29: 48 c7 c2 8c 6a 91 8d mov $0xffffffff8d916a8c,%rdx <-- trapping instruction
30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
37: fc ff df
3a: 48 c1 ea 03 shr $0x3,%rdx
3e: 0f .byte 0xf
----------------
Code disassembly (best guess), 1 bytes skipped:
0: df 0f fisttps (%rdi)
2: b6 04 mov $0x4,%dh
4: 02 49 89 add -0x77(%rcx),%cl
7: cf iret
8: 84 c0 test %al,%al
a: 74 08 je 0x14
c: 3c 03 cmp $0x3,%al
e: 0f 8e 2b 34 00 00 jle 0x343f
14: 41 8b 44 24 20 mov 0x20(%r12),%eax
19: 25 00 80 04 00 and $0x48000,%eax
1e: 3d 00 00 04 00 cmp $0x40000,%eax
23: 0f 84 5e 09 00 00 je 0x987
* 29: 48 c7 c2 8c 6a 91 8d mov $0xffffffff8d916a8c,%rdx <-- trapping instruction
30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
37: fc ff df
3a: 48 c1 ea 03 shr $0x3,%rdx
3e: 0f .byte 0xf
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
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