INFO: task syz.0.116:6117 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.116 state:D stack:25792 pid:6117 tgid:6092 ppid:5222 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752 fdget_pos+0x24e/0x320 fs/file.c:1187 ksys_write+0x7e/0x2b0 fs/read_write.c:727 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdd7ed7dff9 RSP: 002b:00007fdd7fc2d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fdd7ef36058 RCX: 00007fdd7ed7dff9 RDX: 0000000000000118 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 00007fdd7edf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdd7ef36058 R15: 00007ffc6a194b88 Showing all locks held in the system: 3 locks held by kworker/0:1/9: 1 lock held by khungtaskd/30: #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701 2 locks held by kworker/u8:2/35: 4 locks held by kworker/u8:5/1046: 2 locks held by kworker/u8:9/1130: 2 locks held by getty/4977: #0: ffff88802eb970a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/5217: #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffff888050f80278 (&c->state_lock){+.+.}-{3:3}, at: __bch2_fs_stop+0xfd/0x540 fs/bcachefs/super.c:618 2 locks held by syz.0.116/6093: #0: ffff88802dae90b8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1187 #1: ffff8880757a6420 (sb_writers#33){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #1: ffff8880757a6420 (sb_writers#33){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 1 lock held by syz.0.116/6117: #0: ffff88802dae90b8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1187 2 locks held by bch-copygc/loop/6110: 1 lock held by syz-executor/6211: #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 1 lock held by syz.2.241/6953: #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120 1 lock held by syz.2.279/7216: #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.2.279/7229: #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880640a00e0 (&type->s_umount_key#116){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/7301: #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 1 lock held by syz.3.294/7323: #0: ffff88805d65c0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x221/0x9d0 fs/super.c:344 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6110 Comm: bch-copygc/loop Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:mark_lock+0x12c/0x360 kernel/locking/lockdep.c:4700 Code: c7 c7 60 c8 0a 8c 48 c7 c6 00 cb 0a 8c e8 1c 1f e5 ff 90 0f 0b 90 90 90 31 db 48 83 c3 60 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 6a ba 8a 00 41 bc 01 00 00 00 44 85 33 74 16 44 RSP: 0018:ffffc90008f071d8 EFLAGS: 00000046 RAX: 1ffffffff2792630 RBX: ffffffff93c93180 RCX: ffffffff8170879a RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9423f920 RBP: 0000000000000002 R08: ffffffff9423f927 R09: 1ffffffff2847f24 R10: dffffc0000000000 R11: fffffbfff2847f25 R12: ffff888027a84700 R13: dffffc0000000000 R14: 0000000000000004 R15: ffff888027a846e0 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f853542a000 CR3: 0000000027098000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_held_locks kernel/locking/lockdep.c:4318 [inline] __trace_hardirqs_on_caller kernel/locking/lockdep.c:4336 [inline] lockdep_hardirqs_on_prepare+0x282/0x780 kernel/locking/lockdep.c:4403 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x8f/0x140 kernel/locking/spinlock.c:194 bch2_trans_begin+0x785/0x1c00 fs/bcachefs/btree_iter.c:3094 bch2_copygc_get_buckets fs/bcachefs/movinggc.c:164 [inline] bch2_copygc+0x86b/0x4650 fs/bcachefs/movinggc.c:215 bch2_copygc_thread+0x737/0xc20 fs/bcachefs/movinggc.c:375 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244