INFO: task syz-executor.5:7874 blocked for more than 143 seconds. Not tainted 6.1.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:25392 pid:7874 ppid:3685 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5209 [inline] __schedule+0x8c9/0xd70 kernel/sched/core.c:6521 schedule+0xcb/0x190 kernel/sched/core.c:6597 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6656 __mutex_lock_common+0xe4f/0x26e0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 iterate_supers+0x137/0x1f0 fs/super.c:724 ksys_sync+0xd5/0x1c0 fs/sync.c:104 __do_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f665b28c0d9 RSP: 002b:00007f665bf11168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f665b3abf80 RCX: 00007f665b28c0d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f665b2e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd0a8bec3f R14: 00007f665bf11300 R15: 0000000000022000 INFO: task syz-executor.5:7881 blocked for more than 143 seconds. Not tainted 6.1.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:24960 pid:7881 ppid:3685 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5209 [inline] __schedule+0x8c9/0xd70 kernel/sched/core.c:6521 schedule+0xcb/0x190 kernel/sched/core.c:6597 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6656 __mutex_lock_common+0xe4f/0x26e0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 iterate_supers+0x137/0x1f0 fs/super.c:724 ksys_sync+0xd5/0x1c0 fs/sync.c:104 __do_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f665b28c0d9 RSP: 002b:00007f6659dfe168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f665b3ac050 RCX: 00007f665b28c0d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f665b2e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd0a8bec3f R14: 00007f6659dfe300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:0/9: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8d127330 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8d127b30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/28: #0: ffffffff8d127160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/3314: #0: ffff8880280dc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x53b/0x1650 drivers/tty/n_tty.c:2177 3 locks held by syz-executor.0/7147: 3 locks held by syz-executor.1/7254: 2 locks held by syz-executor.5/7874: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/7881: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/8047: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/8048: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/8049: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/8129: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/8130: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 2 locks held by syz-executor.5/8131: #0: ffff8880296a20e0 (&type->s_umount_key#97){.+.+}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:722 #1: ffff8880296a00e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 nmi_cpu_backtrace+0x46f/0x4f0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1ba/0x420 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xcf5/0xd40 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3731 Comm: kworker/1:8 Not tainted 6.1.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_power_efficient gc_worker RIP: 0010:lockdep_hardirqs_on_prepare+0x19c/0x790 kernel/locking/lockdep.c:4318 Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 10 00 74 0f e8 9a a8 74 00 48 ba 00 00 00 00 00 fc ff df 48 8b 44 24 10 4c 8b b0 40 0a 00 00 <48> 8d b8 28 0a 00 00 48 89 f8 48 c1 e8 03 80 3c 10 00 74 05 e8 eb RSP: 0018:ffffc90004b0f960 EFLAGS: 00000046 RAX: ffff8880219c0000 RBX: 1ffff92000961f30 RCX: ffffffff91d8f003 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880219c0a40 RBP: ffffc90004b0fa08 R08: dffffc0000000000 R09: fffffbfff1cebe96 R10: fffffbfff1cebe96 R11: 1ffffffff1cebe95 R12: ffffffff88d3e11a R13: 0000000000000200 R14: 209d87198627f1f1 R15: 1ffff92000961f44 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ebc0a2e680 CR3: 00000000192a5000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49 seqcount_lockdep_reader_access+0x13a/0x1f0 include/linux/seqlock.h:104 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:335 [inline] gc_worker+0x30a/0x1560 net/netfilter/nf_conntrack_core.c:1499 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306