INFO: task syz-executor.5:19118 blocked for more than 143 seconds. Not tainted 5.15.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:23944 pid:19118 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:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff3802b6d37 RSP: 002b:00007ffe347d3f78 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff3802b6d37 RDX: 00007ffe347d404b RSI: 0000000000000002 RDI: 00007ffe347d4040 RBP: 00007ffe347d4040 R08: 00000000ffffffff R09: 00007ffe347d3e10 R10: 0000555555b318e3 R11: 0000000000000206 R12: 00007ff38030ee80 R13: 00007ffe347d5100 R14: 0000555555b31810 R15: 00007ffe347d5140 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97fea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by in:imklog/6228: #0: ffff88801df560f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffffffff8b96f328 (syslog_lock){+.+.}-{3:3}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #1: ffffffff8b96f328 (syslog_lock){+.+.}-{3:3}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #1: ffffffff8b96f328 (syslog_lock){+.+.}-{3:3}, at: rq_lock kernel/sched/sched.h:1620 [inline] #1: ffffffff8b96f328 (syslog_lock){+.+.}-{3:3}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 4 locks held by kworker/u4:10/13881: 2 locks held by syz-executor.5/19118: #0: ffff888034df60e0 (&type->s_umount_key#78){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffff888086ffa338 (&fc->killsb){++++}-{3:3}, at: fuse_mount_remove fs/fuse/inode.c:1716 [inline] #1: ffff888086ffa338 (&fc->killsb){++++}-{3:3}, at: fuse_sb_destroy fs/fuse/inode.c:1751 [inline] #1: ffff888086ffa338 (&fc->killsb){++++}-{3:3}, at: fuse_kill_sb_anon+0x81/0x290 fs/fuse/inode.c:1759 1 lock held by syz-executor.5/26318: #0: ffff888086ffa338 (&fc->killsb){++++}-{3:3}, at: fuse_notify_retrieve fs/fuse/dev.c:1749 [inline] #0: ffff888086ffa338 (&fc->killsb){++++}-{3:3}, at: fuse_notify fs/fuse/dev.c:1787 [inline] #0: ffff888086ffa338 (&fc->killsb){++++}-{3:3}, at: fuse_dev_do_write+0xffc/0x2bd0 fs/fuse/dev.c:1865 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc5-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13171 Comm: kworker/u4:9 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_wait_context kernel/locking/lockdep.c:4704 [inline] RIP: 0010:__lock_acquire+0x562/0x54a0 kernel/locking/lockdep.c:4965 Code: 0f 8e 88 10 00 00 41 8b b5 f0 09 00 00 41 89 f6 41 83 ee 01 0f 88 67 12 00 00 49 b8 00 00 00 00 00 fc ff df 49 63 c6 41 89 d7 <48> 8d 04 80 49 8d ac c5 19 0a 00 00 eb 12 41 83 ee 01 48 83 ed 28 RSP: 0018:ffffc9000325fa60 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffffffff8b97fea0 RCX: 1ffff110114bbbee RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffffff8fcfebf9 RBP: ffffffff8fcfeb40 R08: dffffc0000000000 R09: ffffffff8fcfc927 R10: fffffbfff1f9f924 R11: 0000000000000000 R12: ffff88808a5ddfc8 R13: ffff88808a5dd580 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8dcb49000 CR3: 000000001d9dd000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:410 [inline] batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:721 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: 0f 8e 88 10 00 00 jle 0x108e 6: 41 8b b5 f0 09 00 00 mov 0x9f0(%r13),%esi d: 41 89 f6 mov %esi,%r14d 10: 41 83 ee 01 sub $0x1,%r14d 14: 0f 88 67 12 00 00 js 0x1281 1a: 49 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%r8 21: fc ff df 24: 49 63 c6 movslq %r14d,%rax 27: 41 89 d7 mov %edx,%r15d * 2a: 48 8d 04 80 lea (%rax,%rax,4),%rax <-- trapping instruction 2e: 49 8d ac c5 19 0a 00 lea 0xa19(%r13,%rax,8),%rbp 35: 00 36: eb 12 jmp 0x4a 38: 41 83 ee 01 sub $0x1,%r14d 3c: 48 83 ed 28 sub $0x28,%rbp