INFO: task kworker/u4:7:9559 blocked for more than 143 seconds. Not tainted 5.15.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:7 state:D stack:24992 pid: 9559 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 io_uring_try_cancel_iowq fs/io_uring.c:9582 [inline] io_uring_try_cancel_requests+0x7d1/0xc30 fs/io_uring.c:9612 io_ring_exit_work+0x137/0x19a0 fs/io_uring.c:9412 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b97fe60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 3 locks held by kworker/u4:3/158: 1 lock held by in:imklog/6237: #0: ffff888019c3c370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 3 locks held by kworker/u4:7/9559: #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268 #1: ffffc90004d77db0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272 #2: ffff88803638e0a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_iowq fs/io_uring.c:9582 [inline] #2: ffff88803638e0a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_uring_try_cancel_requests+0x7d1/0xc30 fs/io_uring.c:9612 1 lock held by syz-executor.1/17740: 1 lock held by syz-executor.1/17799: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6531 Comm: syz-fuzzer Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:anon_vma_interval_tree_verify+0xf6/0x1e0 mm/interval_tree.c:109 Code: 00 0f 85 a8 00 00 00 48 89 ea 48 8b 5d 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 be 00 00 00 48 2b 5d 00 <4c> 89 ef 48 c1 eb 0c 49 8d 5c 1c ff 48 89 de e8 76 b7 cc ff 49 39 RSP: 0018:ffffc900011df9e8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 00000000002e1000 RCX: 0000000000000000 RDX: 1ffff1100e82cce7 RSI: ffffffff81a95951 RDI: ffff888074166740 RBP: ffff888074166738 R08: 00000007f1bb5bfb R09: ffff88801e549017 R10: ffffffff81a95943 R11: 0000000000000000 R12: 00000007f1bb5bfb R13: 00000007f1bb5edb R14: ffff88801e549000 R15: ffff888074643cb0 FS: 000000c00002e890(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f69527ec000 CR3: 0000000076ff5000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000d0eb DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: validate_mm+0xfe/0x800 mm/mmap.c:406 __vma_adjust+0x1097/0x2530 mm/mmap.c:1021 vma_merge+0x8e3/0xd20 mm/mmap.c:1227 madvise_behavior mm/madvise.c:139 [inline] madvise_vma mm/madvise.c:1001 [inline] do_madvise.part.0+0xcb7/0x2250 mm/madvise.c:1202 do_madvise mm/madvise.c:1228 [inline] __do_sys_madvise mm/madvise.c:1228 [inline] __se_sys_madvise mm/madvise.c:1226 [inline] __x64_sys_madvise+0x113/0x150 mm/madvise.c:1226 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46e1d7 Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 RSP: 002b:000000c000039e08 EFLAGS: 00000206 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 000000c019e00000 RCX: 000000000046e1d7 RDX: 000000000000000f RSI: 0000000000200000 RDI: 000000c019c00000 RBP: 000000c000039e48 R08: 000000c019e00000 R09: 0030000800000000 R10: 0000000000000001 R11: 0000000000000206 R12: 000000000000003a R13: 0000000000001018 R14: 000080c019000000 R15: 000000c01a64a428 ---------------- Code disassembly (best guess): 0: 00 0f add %cl,(%rdi) 2: 85 a8 00 00 00 48 test %ebp,0x48000000(%rax) 8: 89 ea mov %ebp,%edx a: 48 8b 5d 08 mov 0x8(%rbp),%rbx e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 c1 ea 03 shr $0x3,%rdx 1c: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 20: 0f 85 be 00 00 00 jne 0xe4 26: 48 2b 5d 00 sub 0x0(%rbp),%rbx * 2a: 4c 89 ef mov %r13,%rdi <-- trapping instruction 2d: 48 c1 eb 0c shr $0xc,%rbx 31: 49 8d 5c 1c ff lea -0x1(%r12,%rbx,1),%rbx 36: 48 89 de mov %rbx,%rsi 39: e8 76 b7 cc ff callq 0xffccb7b4 3e: 49 rex.WB 3f: 39 .byte 0x39