INFO: task syz-executor.0:11231 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28224 pid:11231 ppid: 8380 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 schedule_timeout+0x43/0x250 kernel/time/timer.c:1868 do_wait_for_common+0x266/0x3a0 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 io_sq_thread_park fs/io_uring.c:7115 [inline] io_uring_cancel_task_requests+0x229/0x1a90 fs/io_uring.c:8745 __io_uring_files_cancel+0x102/0x320 fs/io_uring.c:8840 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x258/0x2340 kernel/exit.c:780 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x1734/0x1ef0 kernel/signal.c:2773 arch_do_signal_or_restart+0x3c/0x610 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0xac/0x1e0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x48/0x180 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007fd76aea9218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000056bf68 RCX: 0000000000465f69 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000056bf6c RBP: 000000000056bf60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007fff5b5c6fbf R14: 00007fd76aea9300 R15: 0000000000022000 INFO: task iou-sqp-11231:11233 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11231 state:D stack:30064 pid:11233 ppid: 8380 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 schedule_timeout+0x43/0x250 kernel/time/timer.c:1868 do_wait_for_common+0x266/0x3a0 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 io_sq_thread+0x25c/0x1460 fs/io_uring.c:6717 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-11231:11241 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11231 state:D stack:30160 pid:11241 ppid: 8380 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 schedule_timeout+0x43/0x250 kernel/time/timer.c:1868 do_wait_for_common+0x266/0x3a0 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 io_sq_thread+0x25c/0x1460 fs/io_uring.c:6717 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by khungtaskd/1626: #0: ffffffff8c70f900 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8046: #0: ffff8880183dcd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 1 lock held by syz-executor.0/11231: #0: ffff888028035070 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7108 [inline] #0: ffff888028035070 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests+0x1b4/0x1a90 fs/io_uring.c:8745 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1626 Comm: khungtaskd Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x125/0x19e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4829 Comm: systemd-journal Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3568 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3587 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3642 [inline] RIP: 0010:__lock_acquire+0x1406/0x5e60 kernel/locking/lockdep.c:4900 Code: 44 d8 48 85 db 74 59 4c 8d 73 18 4c 89 f0 48 c1 e8 03 80 3c 38 00 74 12 4c 89 f7 e8 24 be 60 00 48 bf 00 00 00 00 00 fc ff df <49> 8b 06 4c 39 e8 74 25 48 83 c3 08 48 89 d8 48 c1 e8 03 80 3c 38 RSP: 0018:ffffc900010ff6b0 EFLAGS: 00000046 RAX: 1ffffffff1e89ac3 RBX: ffffffff8f44d600 RCX: ffffffff815bcf92 RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000 RBP: ffffc900010ff860 R08: dffffc0000000000 R09: fffffbfff1f29aa9 R10: fffffbfff1f29aa9 R11: 0000000000000000 R12: ffff8880122c4158 R13: 42b973709c86184a R14: ffffffff8f44d618 R15: ffff8880122c3780 FS: 00007fb9e61db8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9e35f8000 CR3: 00000000121f3000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x114/0x5f0 kernel/locking/lockdep.c:5510 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x73/0xa0 kernel/locking/spinlock.c:159 __debug_check_no_obj_freed lib/debugobjects.c:975 [inline] debug_check_no_obj_freed+0xa9/0x650 lib/debugobjects.c:1018 free_pages_prepare mm/page_alloc.c:1276 [inline] __free_pages_ok+0x1a9/0xba0 mm/page_alloc.c:1536 free_slab mm/slub.c:1881 [inline] discard_slab mm/slub.c:1887 [inline] unfreeze_partials+0x18c/0x1e0 mm/slub.c:2368 put_cpu_partial+0xd2/0x1a0 mm/slub.c:2404 __slab_free+0x36b/0x670 mm/slub.c:3055 do_slab_free mm/slub.c:3149 [inline] ___cache_free+0xfc/0x120 mm/slub.c:3168 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2c/0xc0 mm/kasan/common.c:437 kasan_slab_alloc include/linux/kasan.h:223 [inline] slab_post_alloc_hook mm/slab.h:516 [inline] slab_alloc_node mm/slub.c:2907 [inline] slab_alloc mm/slub.c:2915 [inline] kmem_cache_alloc+0x1c8/0x330 mm/slub.c:2920 prepare_creds+0x3d/0x5f0 kernel/cred.c:258 access_override_creds fs/open.c:355 [inline] do_faccessat+0x86/0x890 fs/open.c:419 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb9e54969c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff4e7cc8a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff4e7cf8d0 RCX: 00007fb9e54969c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005597938569a3 RBP: 00007fff4e7cc9f0 R08: 000055979384c3e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00005597943f08a0 R15: 00007fff4e7ccee0