INFO: task syz-executor.5:3871 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:26016 pid: 3871 ppid: 12705 flags:0x00004004 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: 0033:0x7f5fe610e8a7 RSP: 002b:00007f5fe3683fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020001200 RCX: 00007f5fe610e8a7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000005 RBP: 00007f5fe36846bc R08: 00007f5fe3684040 R09: 0000000020001180 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000005 R14: 00007f5fe3684000 R15: 0000000020000000 INFO: task syz-executor.5:3871 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.5 state:D stack:26016 pid: 3871 ppid: 12705 flags:0x00004004 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: 0033:0x7f5fe610e8a7 RSP: 002b:00007f5fe3683fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020001200 RCX: 00007f5fe610e8a7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000005 RBP: 00007f5fe36846bc R08: 00007f5fe3684040 R09: 0000000020001180 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000005 R14: 00007f5fe3684000 R15: 0000000020000000 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 2 locks held by systemd-udevd/2969: #0: ffff88801b3ec918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819 #1: ffff88801b3e8360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_open+0x75/0x120 drivers/block/loop.c:1733 1 lock held by in:imklog/6234: 5 locks held by kworker/u4:8/22059: 2 locks held by kworker/1:15/26017: #0: ffff8880b9d39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 #1: ffff8880b9d279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880 1 lock held by syz-executor.5/3871: #0: ffff88801b3e8360 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0x7a/0x1070 drivers/block/loop.c:1106 ============================================= NMI backtrace for cpu 0 CPU: 0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2968 Comm: systemd-journal Not tainted 5.16.0-rc1-next-20211118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline] RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:513 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] RIP: 0010:do_raw_spin_lock+0x132/0x2b0 kernel/locking/spinlock_debug.c:115 Code: 00 00 00 00 e8 ef 4a 61 00 be 04 00 00 00 48 8d 7c 24 28 e8 e0 4a 61 00 8b 44 24 28 ba 01 00 00 00 89 44 24 04 f0 0f b1 55 00 <0f> 85 91 00 00 00 65 44 8b 35 98 ef a4 7e 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90001b2fc30 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 1ffff92000365f87 RCX: ffffffff815d25d0 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90001b2fc58 RBP: ffffffff90724bb0 R08: 0000000000000001 R09: 0000000000000003 R10: fffff52000365f8b R11: 000000000000003f R12: ffffffff90724bb8 R13: ffffffff90724bc0 R14: dead000000000100 R15: dffffc0000000000 FS: 00007f70751908c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7072a4f000 CR3: 000000001b16d000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000006 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x41/0x50 kernel/locking/spinlock.c:162 __debug_check_no_obj_freed lib/debugobjects.c:980 [inline] debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1023 slab_free_hook mm/slub.c:1698 [inline] slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kmem_cache_free+0x92/0x5e0 mm/slub.c:3529 putname fs/namei.c:270 [inline] putname+0xfe/0x140 fs/namei.c:256 do_mkdirat+0x1cd/0x300 fs/namei.c:3918 __do_sys_mkdir fs/namei.c:3929 [inline] __se_sys_mkdir fs/namei.c:3927 [inline] __x64_sys_mkdir+0xf2/0x140 fs/namei.c:3927 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: 0033:0x7f707444b687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff84412ab8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff84415b20 RCX: 00007f707444b687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000563b93ed58a0 RBP: 00007fff84412af0 R08: 0000563b927593e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 0000563b93ed58a0 R15: 00007fff84413130 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: e8 ef 4a 61 00 callq 0x614af8 9: be 04 00 00 00 mov $0x4,%esi e: 48 8d 7c 24 28 lea 0x28(%rsp),%rdi 13: e8 e0 4a 61 00 callq 0x614af8 18: 8b 44 24 28 mov 0x28(%rsp),%eax 1c: ba 01 00 00 00 mov $0x1,%edx 21: 89 44 24 04 mov %eax,0x4(%rsp) 25: f0 0f b1 55 00 lock cmpxchg %edx,0x0(%rbp) * 2a: 0f 85 91 00 00 00 jne 0xc1 <-- trapping instruction 30: 65 44 8b 35 98 ef a4 mov %gs:0x7ea4ef98(%rip),%r14d # 0x7ea4efd0 37: 7e 38: 48 rex.W 39: b8 00 00 00 00 mov $0x0,%eax 3e: 00 fc add %bh,%ah