INFO: task syz-executor.3:11194 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210301-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28312 pid:11194 ppid: 8418 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread_park fs/io_uring.c:7082 [inline] io_sq_thread_park+0xd5/0x130 fs/io_uring.c:7070 io_uring_cancel_task_requests+0x24c/0xd90 fs/io_uring.c:8720 __io_uring_files_cancel+0x110/0x1b0 fs/io_uring.c:8819 io_uring_files_cancel include/linux/io_uring.h:53 [inline] do_exit+0x299/0x2a60 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 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+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007f66bd6bb218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68 RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007ffdd4c9b5af R14: 00007f66bd6bb300 R15: 0000000000022000 INFO: task iou-sqp-11194:11197 can't die for more than 143 seconds. task:iou-sqp-11194 state:D stack:30296 pid:11197 ppid: 8418 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x283/0x19a0 fs/io_uring.c:6681 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-11194:11197 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210301-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11194 state:D stack:30296 pid:11197 ppid: 8418 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x283/0x19a0 fs/io_uring.c:6681 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-11194:11201 can't die for more than 144 seconds. task:iou-sqp-11194 state:D stack:30296 pid:11201 ppid: 8418 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x283/0x19a0 fs/io_uring.c:6681 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-11194:11201 blocked for more than 144 seconds. Not tainted 5.11.0-next-20210301-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11194 state:D stack:30296 pid:11201 ppid: 8418 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x283/0x19a0 fs/io_uring.c:6681 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by khungtaskd/1660: #0: ffffffff8bf741e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8107: 1 lock held by syz-executor.3/11194: #0: ffff88802b82f870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x5d/0x130 fs/io_uring.c:7075 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1660 Comm: khungtaskd Not tainted 5.11.0-next-20210301-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+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd8e/0xf40 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8108 Comm: rs:main Q:Reg Not tainted 5.11.0-next-20210301-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_raw_spin_lock+0x63/0x2b0 kernel/locking/spinlock_debug.c:111 Code: c7 44 24 18 b0 da 59 81 48 8d 14 03 c7 02 f1 f1 f1 f1 c7 42 04 04 f3 f3 f3 48 89 fa 65 48 8b 0c 25 28 00 00 00 48 89 4c 24 60 <31> c9 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c RSP: 0018:ffffc9000bd5f710 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: 1ffff920017abee3 RCX: 0cb6bcf0570d3f00 RDX: ffffffff900729ac RSI: 0000000000000001 RDI: ffffffff900729ac RBP: ffffffff900729a8 R08: 0000000000000000 R09: ffffffff8fabd867 R10: fffffbfff1f57b0c R11: 000000000000003f R12: 0000000000000a02 R13: ffffc9000bd5f8b8 R14: dead000000000100 R15: dffffc0000000000 FS: 00007f00e4d63700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa7072b3020 CR3: 00000000275f8000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline] _raw_spin_lock_irqsave+0x41/0x50 kernel/locking/spinlock.c:159 __debug_check_no_obj_freed lib/debugobjects.c:975 [inline] debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1554 [inline] slab_free_freelist_hook+0xd6/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kmem_cache_free+0x8b/0x730 mm/slub.c:3177 jbd2_free_handle include/linux/jbd2.h:1560 [inline] jbd2_journal_stop+0x666/0xf40 fs/jbd2/transaction.c:1915 __ext4_journal_stop+0xde/0x1f0 fs/ext4/ext4_jbd2.c:127 ext4_dirty_inode+0xe8/0x110 fs/ext4/inode.c:5948 __mark_inode_dirty+0x6e3/0x10f0 fs/fs-writeback.c:2274 generic_update_time+0x21d/0x350 fs/inode.c:1766 update_time fs/inode.c:1779 [inline] file_update_time+0x434/0x520 fs/inode.c:1995 file_modified fs/inode.c:2018 [inline] file_modified+0x7d/0xa0 fs/inode.c:2003 ext4_write_checks fs/ext4/file.c:247 [inline] ext4_buffered_write_iter+0xff/0x4d0 fs/ext4/file.c:264 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:663 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write+0x426/0x650 fs/read_write.c:519 vfs_write+0x796/0xa30 fs/read_write.c:606 ksys_write+0x12d/0x250 fs/read_write.c:659 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f00e77a71cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f00e4d62590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f00dc025840 RCX: 00007f00e77a71cd RDX: 00000000000004d0 RSI: 00007f00dc025840 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f00dc0255c0 R13: 00007f00e4d625b0 R14: 0000564231a5d440 R15: 00000000000004d0