INFO: task syz-executor.0:32446 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:25960 pid:32446 ppid: 19895 flags:0x00024004 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_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 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+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1181 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1216 io_uring_clean_tctx fs/io_uring.c:9614 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9694 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fea1b130739 RSP: 002b:00007fea18686188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 000000000000063f RBX: 00007fea1b235038 RCX: 00007fea1b130739 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006 RBP: 00007fea1b18acc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fea1b235038 R13: 00007ffe4aae45ef R14: 00007fea18686300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by systemd-journal/2967: #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:474 #1: ffff8880b9c1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39d/0x480 kernel/sched/psi.c:880 1 lock held by in:imklog/6312: #0: ffff888077f368f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 1 lock held by kworker/u4:1/6991: #0: ffff8880b9c31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:474 2 locks held by kworker/u4:0/21747: 1 lock held by syz-executor.5/25263: #0: ffff888147e28460 (sb_writers#5){.+.+}-{0:0}, at: __do_splice+0x134/0x250 fs/splice.c:1144 1 lock held by syz-executor.5/25274: #0: ffff888147e28460 (sb_writers#5){.+.+}-{0:0}, at: __do_splice+0x134/0x250 fs/splice.c:1144 1 lock held by syz-executor.5/25281: #0: ffff888147e28460 (sb_writers#5){.+.+}-{0:0}, at: __do_splice+0x134/0x250 fs/splice.c:1144 1 lock held by syz-executor.5/25292: #0: ffff888147e28460 (sb_writers#5){.+.+}-{0:0}, at: __do_splice+0x134/0x250 fs/splice.c:1144 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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: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: 21748 Comm: kworker/u4:4 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:kasan_check_range+0x134/0x180 mm/kasan/generic.c:190 Code: 85 d2 75 0b 48 89 da 48 29 c2 e9 55 ff ff ff 49 39 d2 75 17 49 0f be 02 41 83 e1 07 49 39 c1 7d 0a 5b b8 01 00 00 00 5d 41 5c 44 89 c2 e8 73 f0 ff ff 5b 83 f0 01 5d 41 5c c3 48 29 c3 48 89 RSP: 0018:ffffc90003e67ac8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8936bec1 RDX: fffffbfff174a04d RSI: 0000000000000008 RDI: ffffffff8ba50260 RBP: ffffffff8ba50260 R08: 0000000000000001 R09: ffffffff8ba50267 R10: fffffbfff174a04c R11: 0000000000000000 R12: ffff88803b086180 R13: ffff88803b086180 R14: dffffc0000000000 R15: ffff88803b086180 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe66406ca50 CR3: 000000000b68e000 CR4: 00000000001526f0 Call Trace: instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1667 [inline] __mutex_trylock_common kernel/locking/mutex.c:123 [inline] __mutex_trylock kernel/locking/mutex.c:146 [inline] __mutex_lock_common kernel/locking/mutex.c:598 [inline] __mutex_lock+0x1d1/0x12f0 kernel/locking/mutex.c:729 jump_label_lock kernel/jump_label.c:27 [inline] static_key_disable_cpuslocked+0x108/0x1b0 kernel/jump_label.c:205 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate mm/kfence/core.c:640 [inline] toggle_allocation_gate+0x185/0x390 mm/kfence/core.c:618 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 ---------------- Code disassembly (best guess): 0: 85 d2 test %edx,%edx 2: 75 0b jne 0xf 4: 48 89 da mov %rbx,%rdx 7: 48 29 c2 sub %rax,%rdx a: e9 55 ff ff ff jmpq 0xffffff64 f: 49 39 d2 cmp %rdx,%r10 12: 75 17 jne 0x2b 14: 49 0f be 02 movsbq (%r10),%rax 18: 41 83 e1 07 and $0x7,%r9d 1c: 49 39 c1 cmp %rax,%r9 1f: 7d 0a jge 0x2b 21: 5b pop %rbx 22: b8 01 00 00 00 mov $0x1,%eax 27: 5d pop %rbp 28: 41 5c pop %r12 * 2a: c3 retq <-- trapping instruction 2b: 44 89 c2 mov %r8d,%edx 2e: e8 73 f0 ff ff callq 0xfffff0a6 33: 5b pop %rbx 34: 83 f0 01 xor $0x1,%eax 37: 5d pop %rbp 38: 41 5c pop %r12 3a: c3 retq 3b: 48 29 c3 sub %rax,%rbx 3e: 48 rex.W 3f: 89 .byte 0x89