INFO: task syz-executor.2:16117 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.2 state:D stack:26312 pid:16117 ppid: 8487 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 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 xfs_buf_iowait+0xd5/0x5f0 fs/xfs/xfs_buf.c:1571 __xfs_buf_submit+0x473/0x7f0 fs/xfs/xfs_buf.c:1636 xfs_buf_submit fs/xfs/xfs_buf.c:58 [inline] xfs_buf_read_uncached+0x20d/0x380 fs/xfs/xfs_buf.c:884 xfs_readsb+0x318/0x5f0 fs/xfs/xfs_mount.c:178 xfs_fs_fill_super+0x43f/0x1af0 fs/xfs/xfs_super.c:1428 get_tree_bdev+0x440/0x760 fs/super.c:1293 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:00007fe6b61d1188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000020000140 RSI: 0000000020000000 RDI: 00000000200000c0 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffeafa0543f R14: 00007fe6b61d1300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1578: #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/8368: #0: ffff888029c9d0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 2 locks held by kworker/u4:12/14557: #0: ffff8880b9d51c18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:460 #1: ffff8880b9d1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x16a/0x480 kernel/sched/psi.c:871 1 lock held by syz-executor.2/16117: #0: ffff888024fd00e0 (&type->s_umount_key#81/1){+.+.}-{3:3}, at: alloc_super+0x1dd/0xab0 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1578 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: 14555 Comm: kworker/u4:11 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+0x7a/0x140 kernel/locking/lockdep.c:5668 Code: 9c 8f 04 24 fa 48 c7 c7 a0 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 b6 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 RSP: 0018:ffffc90002867b00 EFLAGS: 00000002 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000202 RDI: 0000000000000000 RBP: ffffffff8b979780 R08: 0000000000000000 R09: ffffffff8d6c4fd7 R10: fffffbfff1ad89fa R11: 0000000000000000 R12: ffff888077a6c280 R13: ffff888077a6cc70 R14: 00000000ffffffff R15: ffffffff88c8b710 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb2c36be000 CR3: 000000001967e000 CR4: 00000000001506f0 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_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x522/0x720 kernel/locking/lockdep.c:5636 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:399 [inline] batadv_nc_purge_paths+0x2a5/0x3a0 net/batman-adv/network-coding.c:467 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): 0: 9c pushfq 1: 8f 04 24 popq (%rsp) 4: fa cli 5: 48 c7 c7 a0 c7 8b 89 mov $0xffffffff898bc7a0,%rdi c: 31 db xor %ebx,%ebx e: e8 6d 0e 00 00 callq 0xe80 13: 41 8b 84 24 e8 09 00 mov 0x9e8(%r12),%eax 1a: 00 1b: 4d 8d ac 24 f0 09 00 lea 0x9f0(%r12),%r13 22: 00 23: 65 ff 05 b6 4e d7 76 incl %gs:0x76d74eb6(%rip) # 0x76d74ee0 * 2a: 85 c0 test %eax,%eax <-- trapping instruction 2c: 7f 12 jg 0x40 2e: e9 88 00 00 00 jmpq 0xbb 33: 83 c3 01 add $0x1,%ebx 36: 41 3b 9c 24 e8 09 00 cmp 0x9e8(%r12),%ebx 3d: 00 3e: 7d 7b jge 0xbb