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Message-ID: <000000000000e540f3061fc68863@google.com>
Date: Thu, 15 Aug 2024 22:50:20 -0700
From: syzbot <syzbot+ca14b36a46a8c541b509@...kaller.appspotmail.com>
To: cgroups@...r.kernel.org, hannes@...xchg.org, linux-kernel@...r.kernel.org,
lizefan.x@...edance.com, mkoutny@...e.com, syzkaller-bugs@...glegroups.com,
tj@...nel.org
Subject: [syzbot] [cgroups?] possible deadlock in task_rq_lock
Hello,
syzbot found the following issue on:
HEAD commit: edd1ec2e3a9f Add linux-next specific files for 20240815
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10ba4ed5980000
kernel config: https://syzkaller.appspot.com/x/.config?x=61ba6f3b22ee5467
dashboard link: https://syzkaller.appspot.com/bug?extid=ca14b36a46a8c541b509
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d063ca2a0d8c/disk-edd1ec2e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/08634f60bc99/vmlinux-edd1ec2e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e6f08ac13836/bzImage-edd1ec2e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ca14b36a46a8c541b509@...kaller.appspotmail.com
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc3-next-20240815-syzkaller #0 Not tainted
------------------------------------------------------
dhcpcd-run-hook/12621 is trying to acquire lock:
ffffffff8e815038 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
but task is already holding lock:
ffff8880b913ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587
raw_spin_rq_lock kernel/sched/sched.h:1485 [inline]
task_rq_lock+0xc6/0x360 kernel/sched/core.c:689
cgroup_move_task+0x92/0x2d0 kernel/sched/psi.c:1161
css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898
cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6690
copy_process+0x3ab1/0x3e30 kernel/fork.c:2620
kernel_clone+0x226/0x8f0 kernel/fork.c:2806
user_mode_thread+0x132/0x1a0 kernel/fork.c:2884
rest_init+0x23/0x300 init/main.c:712
start_kernel+0x47a/0x500 init/main.c:1103
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x147
-> #1 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4113
up+0x72/0x90 kernel/locking/semaphore.c:191
__up_console_sem kernel/printk/printk.c:340 [inline]
__console_unlock kernel/printk/printk.c:2801 [inline]
console_unlock+0x22f/0x4d0 kernel/printk/printk.c:3120
vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348
_printk+0xd5/0x120 kernel/printk/printk.c:2373
set_capacity_and_notify+0x1ae/0x240 block/genhd.c:86
loop_set_size+0x44/0xb0 drivers/block/loop.c:232
loop_configure+0x9fb/0xec0 drivers/block/loop.c:1102
lo_ioctl+0x849/0x1f60
blkdev_ioctl+0x580/0x6b0 block/ioctl.c:676
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 ((console_sem).lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3136 [inline]
check_prevs_add kernel/locking/lockdep.c:3255 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
__down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:323
console_trylock kernel/printk/printk.c:2754 [inline]
console_trylock_spinning kernel/printk/printk.c:1958 [inline]
vprintk_emit+0x2aa/0x7c0 kernel/printk/printk.c:2347
_printk+0xd5/0x120 kernel/printk/printk.c:2373
__report_bug lib/bug.c:195 [inline]
report_bug+0x346/0x500 lib/bug.c:219
handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285
exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
rq_clock kernel/sched/sched.h:1624 [inline]
replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
update_curr+0x575/0xb20 kernel/sched/fair.c:1176
put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505
put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686
put_prev_task kernel/sched/sched.h:2423 [inline]
put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886
__pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946
pick_next_task kernel/sched/core.c:6012 [inline]
__schedule+0x725/0x4ad0 kernel/sched/core.c:6594
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6961
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5766
down_read_trylock+0x24f/0x3c0 kernel/locking/rwsem.c:1568
mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
get_mmap_lock_carefully mm/memory.c:6033 [inline]
lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6093
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86
schedule_tail+0x96/0xb0 kernel/sched/core.c:5205
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock((console_sem).lock);
*** DEADLOCK ***
2 locks held by dhcpcd-run-hook/12621:
#0: ffff888011d14d98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
#0: ffff888011d14d98 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6033 [inline]
#0: ffff888011d14d98 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6093
#1: ffff8880b913ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587
stack backtrace:
CPU: 1 UID: 0 PID: 12621 Comm: dhcpcd-run-hook Not tainted 6.11.0-rc3-next-20240815-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2189
check_prev_add kernel/locking/lockdep.c:3136 [inline]
check_prevs_add kernel/locking/lockdep.c:3255 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
__down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:323
console_trylock kernel/printk/printk.c:2754 [inline]
console_trylock_spinning kernel/printk/printk.c:1958 [inline]
vprintk_emit+0x2aa/0x7c0 kernel/printk/printk.c:2347
_printk+0xd5/0x120 kernel/printk/printk.c:2373
__report_bug lib/bug.c:195 [inline]
report_bug+0x346/0x500 lib/bug.c:219
handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285
exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
RIP: 0010:rq_clock kernel/sched/sched.h:1624 [inline]
RIP: 0010:replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
RIP: 0010:update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
Code: b5 50 fe ff ff 4c 89 ff ba 20 00 00 00 e8 e9 4f 00 00 e9 58 fe ff ff 4c 89 ef be 20 00 00 00 e8 b7 13 00 00 e9 46 fe ff ff 90 <0f> 0b 90 e9 be fb ff ff 89 f1 80 e1 07 38 c1 0f 8c b5 f9 ff ff 48
RSP: 0018:ffffc90004faf668 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b903ea40 RCX: 0000000000000003
RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: 0000000000000031 R08: ffff8880b902c883 R09: 1ffff11017205910
R10: dffffc0000000000 R11: ffffed1017205911 R12: ffff8880b903f468
R13: ffff8880b903f428 R14: 1ffff11017207e8f R15: ffff8880b903f858
update_curr+0x575/0xb20 kernel/sched/fair.c:1176
put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505
put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686
put_prev_task kernel/sched/sched.h:2423 [inline]
put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886
__pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946
pick_next_task kernel/sched/core.c:6012 [inline]
__schedule+0x725/0x4ad0 kernel/sched/core.c:6594
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6961
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5766
Code: 2b 00 74 08 4c 89 f7 e8 2a 39 8c 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90004fafba0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920009f5f80 RCX: 5f14a1617595db00
RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: ffffc90004fafce8 R08: ffffffff9375c837 R09: 1ffffffff26eb906
R10: dffffc0000000000 R11: fffffbfff26eb907 R12: 1ffff920009f5f7c
R13: dffffc0000000000 R14: ffffc90004fafc00 R15: 0000000000000246
down_read_trylock+0x24f/0x3c0 kernel/locking/rwsem.c:1568
mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
get_mmap_lock_carefully mm/memory.c:6033 [inline]
lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6093
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:88
Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90004faff00 EFLAGS: 00050206
RAX: 000000000000314d RBX: 0000000000000000 RCX: 00007f0b3e35e650
RDX: 0000000000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: ffff8880217fa490 R08: ffffffff9018b8af R09: 1ffffffff2031715
R10: dffffc0000000000 R11: fffffbfff2031716 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000000314d R15: dffffc0000000000
schedule_tail+0x96/0xb0 kernel/sched/core.c:5205
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
WARNING: CPU: 1 PID: 12621 at kernel/sched/sched.h:1476 lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
WARNING: CPU: 1 PID: 12621 at kernel/sched/sched.h:1476 rq_clock kernel/sched/sched.h:1624 [inline]
WARNING: CPU: 1 PID: 12621 at kernel/sched/sched.h:1476 replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
WARNING: CPU: 1 PID: 12621 at kernel/sched/sched.h:1476 update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
Modules linked in:
CPU: 1 UID: 0 PID: 12621 Comm: dhcpcd-run-hook Not tainted 6.11.0-rc3-next-20240815-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
RIP: 0010:rq_clock kernel/sched/sched.h:1624 [inline]
RIP: 0010:replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
RIP: 0010:update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
Code: b5 50 fe ff ff 4c 89 ff ba 20 00 00 00 e8 e9 4f 00 00 e9 58 fe ff ff 4c 89 ef be 20 00 00 00 e8 b7 13 00 00 e9 46 fe ff ff 90 <0f> 0b 90 e9 be fb ff ff 89 f1 80 e1 07 38 c1 0f 8c b5 f9 ff ff 48
RSP: 0018:ffffc90004faf668 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b903ea40 RCX: 0000000000000003
RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: 0000000000000031 R08: ffff8880b902c883 R09: 1ffff11017205910
R10: dffffc0000000000 R11: ffffed1017205911 R12: ffff8880b903f468
R13: ffff8880b903f428 R14: 1ffff11017207e8f R15: ffff8880b903f858
FS: 00007f0b3e35e380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b3e35e650 CR3: 000000006f33e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
update_curr+0x575/0xb20 kernel/sched/fair.c:1176
put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505
put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686
put_prev_task kernel/sched/sched.h:2423 [inline]
put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886
__pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946
pick_next_task kernel/sched/core.c:6012 [inline]
__schedule+0x725/0x4ad0 kernel/sched/core.c:6594
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6961
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5766
Code: 2b 00 74 08 4c 89 f7 e8 2a 39 8c 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90004fafba0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920009f5f80 RCX: 5f14a1617595db00
RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: ffffc90004fafce8 R08: ffffffff9375c837 R09: 1ffffffff26eb906
R10: dffffc0000000000 R11: fffffbfff26eb907 R12: 1ffff920009f5f7c
R13: dffffc0000000000 R14: ffffc90004fafc00 R15: 0000000000000246
down_read_trylock+0x24f/0x3c0 kernel/locking/rwsem.c:1568
mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
get_mmap_lock_carefully mm/memory.c:6033 [inline]
lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6093
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:88
Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90004faff00 EFLAGS: 00050206
RAX: 000000000000314d RBX: 0000000000000000 RCX: 00007f0b3e35e650
RDX: 0000000000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: ffff8880217fa490 R08: ffffffff9018b8af R09: 1ffffffff2031715
R10: dffffc0000000000 R11: fffffbfff2031716 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000000314d R15: dffffc0000000000
schedule_tail+0x96/0xb0 kernel/sched/core.c:5205
ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
----------------
Code disassembly (best guess):
0: 2b 00 sub (%rax),%eax
2: 74 08 je 0xc
4: 4c 89 f7 mov %r14,%rdi
7: e8 2a 39 8c 00 call 0x8c3936
c: f6 44 24 61 02 testb $0x2,0x61(%rsp)
11: 0f 85 85 01 00 00 jne 0x19c
17: 41 f7 c7 00 02 00 00 test $0x200,%r15d
1e: 74 01 je 0x21
20: fb sti
21: 48 c7 44 24 40 0e 36 movq $0x45e0360e,0x40(%rsp)
28: e0 45
* 2a: 4b c7 44 25 00 00 00 movq $0x0,0x0(%r13,%r12,1) <-- trapping instruction
31: 00 00
33: 43 c7 44 25 09 00 00 movl $0x0,0x9(%r13,%r12,1)
3a: 00 00
3c: 43 rex.XB
3d: c7 .byte 0xc7
3e: 44 rex.R
3f: 25 .byte 0x25
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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