INFO: task syz-executor.4:10173 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27560 pid:10173 ppid: 8834 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 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 kthread_stop+0x104/0x4f0 kernel/kthread.c:648 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 ext4_fill_super+0x74d9/0xbee0 fs/ext4/super.c:5186 mount_bdev+0x2cb/0x3b0 fs/super.c:1368 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:610 vfs_get_tree+0x7f/0x2c0 fs/super.c:1498 do_new_mount fs/namespace.c:2919 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3249 do_mount fs/namespace.c:3262 [inline] __do_sys_mount fs/namespace.c:3470 [inline] __se_sys_mount fs/namespace.c:3447 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3447 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: 0033:0x467afa RSP: 002b:00007f903f39efa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007f903f39f000 RBP: 00007f903f39f040 R08: 00007f903f39f040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007f903f39f000 R15: 0000000020000200 INFO: task syz-executor.5:10273 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27088 pid:10273 ppid: 8837 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 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 kthread_stop+0x104/0x4f0 kernel/kthread.c:648 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 ext4_fill_super+0x74d9/0xbee0 fs/ext4/super.c:5186 mount_bdev+0x2cb/0x3b0 fs/super.c:1368 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:610 vfs_get_tree+0x7f/0x2c0 fs/super.c:1498 do_new_mount fs/namespace.c:2919 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3249 do_mount fs/namespace.c:3262 [inline] __do_sys_mount fs/namespace.c:3470 [inline] __se_sys_mount fs/namespace.c:3447 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3447 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: 0033:0x467afa RSP: 002b:00007f3ed0cb8fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007f3ed0cb9000 RBP: 00007f3ed0cb9040 R08: 00007f3ed0cb9040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007f3ed0cb9000 R15: 0000000020000200 INFO: task syz-executor.3:10275 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27456 pid:10275 ppid: 8830 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 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 kthread_stop+0x104/0x4f0 kernel/kthread.c:648 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 ext4_fill_super+0x74d9/0xbee0 fs/ext4/super.c:5186 mount_bdev+0x2cb/0x3b0 fs/super.c:1368 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:610 vfs_get_tree+0x7f/0x2c0 fs/super.c:1498 do_new_mount fs/namespace.c:2919 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3249 do_mount fs/namespace.c:3262 [inline] __do_sys_mount fs/namespace.c:3470 [inline] __se_sys_mount fs/namespace.c:3447 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3447 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: 0033:0x467afa RSP: 002b:00007fa0ec41cfa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007fa0ec41d000 RBP: 00007fa0ec41d040 R08: 00007fa0ec41d040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007fa0ec41d000 R15: 0000000020000200 INFO: task syz-executor.2:10282 blocked for more than 144 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27688 pid:10282 ppid: 8832 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 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 kthread_stop+0x104/0x4f0 kernel/kthread.c:648 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 ext4_fill_super+0x74d9/0xbee0 fs/ext4/super.c:5186 mount_bdev+0x2cb/0x3b0 fs/super.c:1368 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:610 vfs_get_tree+0x7f/0x2c0 fs/super.c:1498 do_new_mount fs/namespace.c:2919 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3249 do_mount fs/namespace.c:3262 [inline] __do_sys_mount fs/namespace.c:3470 [inline] __se_sys_mount fs/namespace.c:3447 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3447 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: 0033:0x467afa RSP: 002b:00007fdb4c64ffa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007fdb4c650000 RBP: 00007fdb4c650040 R08: 00007fdb4c650040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007fdb4c650000 R15: 0000000020000200 INFO: task syz-executor.1:10310 blocked for more than 144 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27624 pid:10310 ppid: 8838 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 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 kthread_stop+0x104/0x4f0 kernel/kthread.c:648 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 ext4_fill_super+0x74d9/0xbee0 fs/ext4/super.c:5186 mount_bdev+0x2cb/0x3b0 fs/super.c:1368 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:610 vfs_get_tree+0x7f/0x2c0 fs/super.c:1498 do_new_mount fs/namespace.c:2919 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3249 do_mount fs/namespace.c:3262 [inline] __do_sys_mount fs/namespace.c:3470 [inline] __se_sys_mount fs/namespace.c:3447 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3447 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: 0033:0x467afa RSP: 002b:00007f29f531dfa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007f29f531e000 RBP: 00007f29f531e040 R08: 00007f29f531e040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007f29f531e000 R15: 0000000020000200 INFO: task syz-executor.0:10336 blocked for more than 144 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27768 pid:10336 ppid: 8835 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x907/0x26b0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_timeout+0x19d/0x250 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 kthread_stop+0x104/0x4f0 kernel/kthread.c:648 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 ext4_fill_super+0x74d9/0xbee0 fs/ext4/super.c:5186 mount_bdev+0x2cb/0x3b0 fs/super.c:1368 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:610 vfs_get_tree+0x7f/0x2c0 fs/super.c:1498 do_new_mount fs/namespace.c:2919 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3249 do_mount fs/namespace.c:3262 [inline] __do_sys_mount fs/namespace.c:3470 [inline] __se_sys_mount fs/namespace.c:3447 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3447 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: 0033:0x467afa RSP: 002b:00007f2426c6ffa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007f2426c70000 RBP: 00007f2426c70040 R08: 00007f2426c70040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007f2426c70000 R15: 0000000020000200 Showing all locks held in the system: 1 lock held by khungtaskd/1616: #0: ffffffff8ab72940 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by kworker/u4:6/4570: #0: ffff8880b9f35ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:460 #1: ffff8880b9f1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x16a/0x480 kernel/sched/psi.c:871 1 lock held by in:imklog/8140: #0: ffff888020298d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:974 1 lock held by syz-executor.4/10173: #0: ffff8880162a20e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0xa00 fs/super.c:229 1 lock held by syz-executor.5/10273: #0: ffff88801792e0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0xa00 fs/super.c:229 1 lock held by syz-executor.3/10275: #0: ffff8880466380e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0xa00 fs/super.c:229 1 lock held by syz-executor.2/10282: #0: ffff88802c18a0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0xa00 fs/super.c:229 1 lock held by syz-executor.1/10310: #0: ffff88802dd240e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0xa00 fs/super.c:229 1 lock held by syz-executor.0/10336: #0: ffff8880488a80e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0xa00 fs/super.c:229 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1616 Comm: khungtaskd Not tainted 5.14.0-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+0x57/0x7d lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11f/0x170 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+0x92e/0xc40 kernel/hung_task.c:295 kthread+0x38b/0x460 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: 4570 Comm: kworker/u4:6 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_purge_orig RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline] RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:199 [inline] RIP: 0010:mark_lock+0xea/0x1840 kernel/locking/lockdep.c:4571 Code: 3c 03 0f 8e 6a 08 00 00 41 0f b7 55 20 66 81 e2 ff 1f 44 0f b7 f2 be 08 00 00 00 4c 89 f0 48 c1 f8 06 48 8d 3c c5 e0 88 db 8e 21 e2 53 00 4c 0f a3 35 89 15 89 0d 0f 83 03 01 00 00 4b 8d 04 RSP: 0018:ffffc90008fa7a40 EFLAGS: 00000012 RAX: 000000000000001a RBX: 1ffff920011f4f4e RCX: 0000000000000006 RDX: 0000000000000683 RSI: 0000000000000008 RDI: ffffffff8edb89b0 RBP: 0000000000000040 R08: 0000000000000000 R09: ffffffff8edb89c7 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000006 R13: ffff8880268289f0 R14: 0000000000000683 R15: ffff888026828a10 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3dc3a4b000 CR3: 0000000034d6d000 CR4: 0000000000350ef0 Call Trace: mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:4194 __trace_hardirqs_on_caller kernel/locking/lockdep.c:4220 [inline] lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4280 [inline] lockdep_hardirqs_on_prepare+0x28b/0x400 kernel/locking/lockdep.c:4232 trace_hardirqs_on+0x1c/0x140 kernel/trace/trace_preemptirq.c:49 __local_bh_enable_ip+0xa0/0x120 kernel/softirq.c:388 spin_unlock_bh include/linux/spinlock.h:399 [inline] batadv_purge_orig_ref+0x910/0x1060 net/batman-adv/originator.c:1329 batadv_purge_orig+0x11/0x60 net/batman-adv/originator.c:1342 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2276 worker_thread+0x598/0x1040 kernel/workqueue.c:2422 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 3c 03 cmp $0x3,%al 2: 0f 8e 6a 08 00 00 jle 0x872 8: 41 0f b7 55 20 movzwl 0x20(%r13),%edx d: 66 81 e2 ff 1f and $0x1fff,%dx 12: 44 0f b7 f2 movzwl %dx,%r14d 16: be 08 00 00 00 mov $0x8,%esi 1b: 4c 89 f0 mov %r14,%rax 1e: 48 c1 f8 06 sar $0x6,%rax 22: 48 8d 3c c5 e0 88 db lea -0x71247720(,%rax,8),%rdi 29: 8e 2a: e8 21 e2 53 00 callq 0x53e250 <-- trapping instruction 2f: 4c 0f a3 35 89 15 89 bt %r14,0xd891589(%rip) # 0xd8915c0 36: 0d 37: 0f 83 03 01 00 00 jae 0x140 3d: 4b rex.WXB 3e: 8d .byte 0x8d 3f: 04 .byte 0x4