INFO: task syz-executor.2:23884 can't die for more than 143 seconds. task:syz-executor.2 state:D stack:27400 pid:23884 ppid: 6552 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4987 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6268 schedule+0xd2/0x260 kernel/sched/core.c:6341 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178 __loop_clr_fd+0x1ae/0x1070 drivers/block/loop.c:1122 loop_clr_fd drivers/block/loop.c:1237 [inline] lo_ioctl+0x398/0x17c0 drivers/block/loop.c:1562 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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: 0033:0x7f91d9c168a7 RSP: 002b:00007f91d718bfa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020001640 RCX: 00007f91d9c168a7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 RBP: 00007f91d718c6bc R08: 00007f91d718c040 R09: 0000000020000080 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000016 R14: 00007f91d718c000 R15: 0000000020001740 INFO: task syz-executor.2:23884 blocked for more than 143 seconds. Not tainted 5.16.0-rc1-next-20211118-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27400 pid:23884 ppid: 6552 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4987 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6268 schedule+0xd2/0x260 kernel/sched/core.c:6341 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178 __loop_clr_fd+0x1ae/0x1070 drivers/block/loop.c:1122 loop_clr_fd drivers/block/loop.c:1237 [inline] lo_ioctl+0x398/0x17c0 drivers/block/loop.c:1562 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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: 0033:0x7f91d9c168a7 RSP: 002b:00007f91d718bfa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020001640 RCX: 00007f91d9c168a7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 RBP: 00007f91d718c6bc R08: 00007f91d718c040 R09: 0000000020000080 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000016 R14: 00007f91d718c000 R15: 0000000020001740 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by systemd-udevd/2973: #0: ffff88801a702918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 1 lock held by in:imklog/6394: #0: ffff8880230d2870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by systemd-udevd/16462: #0: ffff88801a702918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 #1: ffff88801a6fe360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_open+0x75/0x120 drivers/block/loop.c:1733 1 lock held by syz-executor.2/23884: #0: ffff88801a6fe360 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0x7a/0x1070 drivers/block/loop.c:1106 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-next-20211118-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:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x405/0x4f0 kernel/kthread.c:327 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: 6487 Comm: kworker/u4:6 Not tainted 5.16.0-rc1-next-20211118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5380 [inline] RIP: 0010:lock_is_held_type+0x9f/0x140 kernel/locking/lockdep.c:5680 Code: 05 96 41 c1 76 85 c0 7f 12 e9 8a 00 00 00 83 c3 01 41 3b 9c 24 60 0a 00 00 7d 7d 48 63 c3 48 89 ee 48 8d 04 80 4d 8d 7c c5 00 <4c> 89 ff e8 99 fe ff ff 85 c0 74 d8 41 83 fe ff 41 bd 01 00 00 00 RSP: 0018:ffffc90001fc7938 EFLAGS: 00000093 RAX: 000000000000000f RBX: 0000000000000003 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8bb83ae0 RDI: ffff8880236a0ab8 RBP: ffffffff8bb83ae0 R08: 0000000000000000 R09: ffffffff8d90e7d7 R10: fffffbfff1b21cfa R11: 000000000000003f R12: ffff8880236a0000 R13: ffff8880236a0a68 R14: 00000000ffffffff R15: ffff8880236a0ae0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3418222018 CR3: 00000001406f4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_tlb_flush include/trace/events/tlb.h:38 [inline] trace_tlb_flush+0x126/0x1b0 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x4a4/0xa10 arch/x86/mm/tlb.c:629 use_temporary_mm arch/x86/kernel/alternative.c:924 [inline] __text_poke+0x44a/0x8c0 arch/x86/kernel/alternative.c:1021 text_poke_bp_batch+0x3d7/0x560 arch/x86/kernel/alternative.c:1361 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline] text_poke_flush arch/x86/kernel/alternative.c:1448 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:732 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:724 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 05 96 41 c1 76 add $0x76c14196,%eax 5: 85 c0 test %eax,%eax 7: 7f 12 jg 0x1b 9: e9 8a 00 00 00 jmpq 0x98 e: 83 c3 01 add $0x1,%ebx 11: 41 3b 9c 24 60 0a 00 cmp 0xa60(%r12),%ebx 18: 00 19: 7d 7d jge 0x98 1b: 48 63 c3 movslq %ebx,%rax 1e: 48 89 ee mov %rbp,%rsi 21: 48 8d 04 80 lea (%rax,%rax,4),%rax 25: 4d 8d 7c c5 00 lea 0x0(%r13,%rax,8),%r15 * 2a: 4c 89 ff mov %r15,%rdi <-- trapping instruction 2d: e8 99 fe ff ff callq 0xfffffecb 32: 85 c0 test %eax,%eax 34: 74 d8 je 0xe 36: 41 83 fe ff cmp $0xffffffff,%r14d 3a: 41 bd 01 00 00 00 mov $0x1,%r13d