INFO: task syz-executor.5:7622 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.5 state:D stack:23576 pid: 7622 ppid: 1 flags:0x00004004 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 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 fuse_mount_remove fs/fuse/inode.c:1716 [inline] fuse_sb_destroy fs/fuse/inode.c:1751 [inline] fuse_kill_sb_anon+0x81/0x290 fs/fuse/inode.c:1759 deactivate_locked_super+0x94/0x160 fs/super.c:335 deactivate_super+0xad/0xd0 fs/super.c:366 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1137 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/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: 0033:0x467a57 RSP: 002b:0000000000a9ec68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000093f RCX: 0000000000467a57 RDX: 0000000000a9ed3b RSI: 0000000000000002 RDI: 0000000000a9ed30 RBP: 0000000000a9ed30 R08: 00000000ffffffff R09: 0000000000a9eb00 R10: 0000000002994883 R11: 0000000000000206 R12: 00000000004bee90 R13: 0000000000a9fe00 R14: 0000000002994810 R15: 0000000000a9fe40 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97fe20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6245: #0: ffff88807d89eaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by syz-executor.5/7622: #0: ffff88803b9720e0 (&type->s_umount_key#53){++++}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffff88807c14f338 (&fc->killsb){++++}-{3:3}, at: fuse_mount_remove fs/fuse/inode.c:1716 [inline] #1: ffff88807c14f338 (&fc->killsb){++++}-{3:3}, at: fuse_sb_destroy fs/fuse/inode.c:1751 [inline] #1: ffff88807c14f338 (&fc->killsb){++++}-{3:3}, at: fuse_kill_sb_anon+0x81/0x290 fs/fuse/inode.c:1759 1 lock held by syz-executor.5/1935: #0: ffff88807c14f338 (&fc->killsb){++++}-{3:3}, at: fuse_notify_retrieve fs/fuse/dev.c:1749 [inline] #0: ffff88807c14f338 (&fc->killsb){++++}-{3:3}, at: fuse_notify fs/fuse/dev.c:1787 [inline] #0: ffff88807c14f338 (&fc->killsb){++++}-{3:3}, at: fuse_dev_do_write+0xffc/0x2bd0 fs/fuse/dev.c:1865 ============================================= 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: 2965 Comm: systemd-journal Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline] RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline] RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:330 [inline] RIP: 0010:rcu_is_watching+0x72/0xc0 kernel/rcu/tree.c:1121 Code: 04 00 00 00 48 89 df e8 fc 97 5b 00 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 <38> d0 7c 04 84 d2 75 19 8b 03 83 e0 01 65 ff 0d aa 2b a0 7e 74 03 RSP: 0018:ffffc9000228f9b0 EFLAGS: 00000206 RAX: 0000000000000003 RBX: ffff8880b9c32a08 RCX: ffffffff8161c424 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880b9c32a08 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff8880b9c32a0b R10: ffffed1017386541 R11: 0000000000086089 R12: ffffc9000228fac0 R13: 0000000000000000 R14: ffff88807a610000 R15: ffffc9000228fdf8 FS: 00007f289f1f18c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f289c696000 CR3: 0000000023e14000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kernel_text_address kernel/extable.c:139 [inline] kernel_text_address+0x56/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x81/0x190 mm/slub.c:1725 slab_free mm/slub.c:3483 [inline] kmem_cache_free+0x8a/0x5b0 mm/slub.c:3499 security_file_free+0xa4/0xd0 security/security.c:1534 file_free fs/file_table.c:55 [inline] __fput+0x3d8/0x9f0 fs/file_table.c:298 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/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: 0033:0x7f289e780840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffcfadb59b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffcfadb5cc0 RCX: 00007f289e780840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055ab2754c7c0 RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055ab27548040 R14: 00007ffcfadb5c80 R15: 000055ab27554820 ---------------- Code disassembly (best guess): 0: 04 00 add $0x0,%al 2: 00 00 add %al,(%rax) 4: 48 89 df mov %rbx,%rdi 7: e8 fc 97 5b 00 callq 0x5b9808 c: 48 89 da mov %rbx,%rdx f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 48 c1 ea 03 shr $0x3,%rdx 1d: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx 21: 48 89 d8 mov %rbx,%rax 24: 83 e0 07 and $0x7,%eax 27: 83 c0 03 add $0x3,%eax * 2a: 38 d0 cmp %dl,%al <-- trapping instruction 2c: 7c 04 jl 0x32 2e: 84 d2 test %dl,%dl 30: 75 19 jne 0x4b 32: 8b 03 mov (%rbx),%eax 34: 83 e0 01 and $0x1,%eax 37: 65 ff 0d aa 2b a0 7e decl %gs:0x7ea02baa(%rip) # 0x7ea02be8 3e: 74 03 je 0x43