INFO: task syz-executor.3:11675 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28664 pid:11675 ppid: 11671 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 grab_super+0x59/0x260 fs/super.c:389 sget_fc+0x24c/0x7c0 fs/super.c:562 get_tree_bdev+0x1bb/0x760 fs/super.c:1263 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2923 [inline] path_mount+0x134a/0x1fc0 fs/namespace.c:3253 do_mount fs/namespace.c:3266 [inline] __do_sys_mount fs/namespace.c:3474 [inline] __se_sys_mount fs/namespace.c:3451 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3451 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: 0033:0x4665f9 RSP: 002b:00007f25796be188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000020000140 RSI: 00000000200002c0 RDI: 0000000020000180 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff465d5a6f R14: 00007f25796be300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1636: #0: ffffffff8b979840 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/8140: #0: ffff888023042d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 1 lock held by syz-executor.3/11671: #0: ffff8880ac5a80e0 (&type->s_umount_key#88/1){+.+.}-{3:3}, at: alloc_super+0x1dd/0xab0 fs/super.c:229 2 locks held by syz-executor.3/11675: #0: ffff88801aedc818 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: get_tree_bdev+0x10a/0x760 fs/super.c:1253 #1: ffff8880ac5a80e0 (&type->s_umount_key#89){+.+.}-{3:3}, at: grab_super+0x59/0x260 fs/super.c:389 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1636 Comm: khungtaskd Not tainted 5.14.0-rc7-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:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 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:210 [inline] watchdog+0xd0a/0xfc0 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: 11157 Comm: kworker/u4:8 Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5365 [inline] RIP: 0010:lock_is_held_type+0x83/0x140 kernel/locking/lockdep.c:5668 Code: c7 8b 89 31 db e8 6d 0e 00 00 41 8b 84 24 e8 09 00 00 4d 8d ac 24 f0 09 00 00 65 ff 05 96 4e d7 76 85 c0 7f 12 e9 88 00 00 00 <83> c3 01 41 3b 9c 24 e8 09 00 00 7d 7b 48 63 c3 48 89 ee 48 8d 04 RSP: 0018:ffffc90001a67ad8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8b979780 RDI: ffff888079dc69f0 RBP: ffffffff8b979780 R08: 0000000000000000 R09: ffffffff8d6c5217 R10: fffffbfff1ad8a42 R11: 0000000000000000 R12: ffff888079dc6000 R13: ffff888079dc69f0 R14: 00000000ffffffff R15: ffff888079dc69f0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6cbab7d000 CR3: 000000001b0ed000 CR4: 00000000001506f0 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5596 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] batadv_nc_purge_paths+0xdf/0x3a0 net/batman-adv/network-coding.c:438 batadv_nc_worker+0x836/0xe50 net/batman-adv/network-coding.c:718 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 31 db xor %ebx,%ebx 2: e8 6d 0e 00 00 callq 0xe74 7: 41 8b 84 24 e8 09 00 mov 0x9e8(%r12),%eax e: 00 f: 4d 8d ac 24 f0 09 00 lea 0x9f0(%r12),%r13 16: 00 17: 65 ff 05 96 4e d7 76 incl %gs:0x76d74e96(%rip) # 0x76d74eb4 1e: 85 c0 test %eax,%eax 20: 7f 12 jg 0x34 22: e9 88 00 00 00 jmpq 0xaf * 27: 83 c3 01 add $0x1,%ebx <-- trapping instruction 2a: 41 3b 9c 24 e8 09 00 cmp 0x9e8(%r12),%ebx 31: 00 32: 7d 7b jge 0xaf 34: 48 63 c3 movslq %ebx,%rax 37: 48 89 ee mov %rbp,%rsi 3a: 48 rex.W 3b: 8d .byte 0x8d 3c: 04 .byte 0x4