INFO: task syz-executor.0:11925 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:28352 pid:11925 ppid: 8469 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_finish+0x96/0x580 fs/io_uring.c:7152 io_sq_offload_create fs/io_uring.c:7929 [inline] io_uring_create fs/io_uring.c:9465 [inline] io_uring_setup+0x1fb2/0x2c20 fs/io_uring.c:9550 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007f9227421108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000020ffc000 RSI: 0000000020000200 RDI: 0000000000006923 RBP: 0000000020000200 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000020ffc000 R14: 0000000000000000 R15: 0000000020ffc000 INFO: task syz-executor.0:11925 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210225-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28352 pid:11925 ppid: 8469 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_finish+0x96/0x580 fs/io_uring.c:7152 io_sq_offload_create fs/io_uring.c:7929 [inline] io_uring_create fs/io_uring.c:9465 [inline] io_uring_setup+0x1fb2/0x2c20 fs/io_uring.c:9550 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007f9227421108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000020ffc000 RSI: 0000000020000200 RDI: 0000000000006923 RBP: 0000000020000200 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000020ffc000 R14: 0000000000000000 R15: 0000000020ffc000 INFO: task iou-sqp-11925:11942 can't die for more than 143 seconds. task:iou-sqp-11925 state:D stack:30296 pid:11942 ppid: 8469 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+0x27d/0x19a0 fs/io_uring.c:6731 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-11925:11942 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210225-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-11925 state:D stack:30296 pid:11942 ppid: 8469 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+0x27d/0x19a0 fs/io_uring.c:6731 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by ksoftirqd/1/18: #0: ffff8880b9d35198 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1321 [inline] #0: ffff8880b9d35198 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4992 1 lock held by khungtaskd/1656: #0: ffffffff8bf744e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8134: #0: ffff8880260af4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1656 Comm: khungtaskd Not tainted 5.11.0-next-20210225-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: 8135 Comm: rs:main Q:Reg Not tainted 5.11.0-next-20210225-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hardirqs_on+0x2/0x1c0 kernel/trace/trace_preemptirq.c:41 Code: ff 0f 0b e9 56 ff ff ff e8 db 13 fa ff 0f 0b e9 eb fe ff ff e8 df fa 3d 00 eb 8f 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 54 <55> 53 e8 b7 13 fa ff 65 8b 1d 00 a6 89 7e 31 ff 89 de e8 27 1b fa RSP: 0018:ffffc9000bd474e8 EFLAGS: 00000006 RAX: 00000000000000ce RBX: 0000000000000000 RCX: 0000000000000000 RDX: 1ffff11027fff6ec RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000004 R08: 0000000000000000 R09: ffffea0000b814c7 R10: fffff94000170298 R11: 0000000000000100 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffea0000b814c8 R15: ffff88813fffb700 FS: 00007fe215892700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f54a28da000 CR3: 0000000011a2f000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rmqueue_pcplist mm/page_alloc.c:3476 [inline] rmqueue mm/page_alloc.c:3499 [inline] get_page_from_freelist+0x2505/0x3f50 mm/page_alloc.c:3964 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:5017 alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2277 alloc_pages include/linux/gfp.h:561 [inline] __page_cache_alloc mm/filemap.c:978 [inline] __page_cache_alloc+0x2c7/0x360 mm/filemap.c:963 pagecache_get_page+0x38f/0x18d0 mm/filemap.c:1817 grab_cache_page_write_begin+0x64/0x90 mm/filemap.c:3545 ext4_da_write_begin+0x35c/0x1160 fs/ext4/inode.c:2986 generic_perform_write+0x20a/0x4f0 mm/filemap.c:3595 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:269 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: 0033:0x7fe2182d61cd 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:00007fe215891590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe20c015880 RCX: 00007fe2182d61cd RDX: 0000000000000475 RSI: 00007fe20c015880 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fe20c015600 R13: 00007fe2158915b0 R14: 00005598ff144360 R15: 0000000000000475