INFO: task syz-executor:6530 blocked for more than 144 seconds.
      Not tainted 6.13.0-rc6-syzkaller-00038-g09a0fa92e5b4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21280 pid:6530  tgid:6530  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:216
 __writeback_inodes_sb_nr+0x2d2/0x380 fs/fs-writeback.c:2735
 sync_filesystem+0xa4/0x230 fs/sync.c:54
 generic_shutdown_super+0x72/0x2d0 fs/super.c:621
 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2278
 deactivate_locked_super+0xc6/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x251/0x310 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ac4b87057
RSP: 002b:00007ffc67bb2218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f2ac4b87057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc67bb22d0
RBP: 00007ffc67bb22d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc67bb3350
R13: 00007f2ac4c018f4 R14: 00007ffc67bb3390 R15: 000000000000000f
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
2 locks held by kworker/u8:5/1095:
 #0: ffff888140af3948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff888140af3948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
 #1: ffffc90003cefd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90003cefd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
6 locks held by kworker/u8:6/1154:
2 locks held by getty/5583:
 #0: ffff888034db20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by syz-executor/5819:
2 locks held by kworker/u8:9/6045:
2 locks held by kworker/u8:11/6460:
1 lock held by syz-executor/6530:
 #0: ffff8880248220e0 (&type->s_umount_key#90){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880248220e0 (&type->s_umount_key#90){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff8880248220e0 (&type->s_umount_key#90){+.+.}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
4 locks held by bch-reclaim/loo/7294:
 #0: ffff888067fcb0a8 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x167/0x560 fs/bcachefs/journal_reclaim.c:739
 #1: ffff888067f84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:158 [inline]
 #1: ffff888067f84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:249 [inline]
 #1: ffff888067f84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7e1/0xd30 fs/bcachefs/btree_iter.c:3228
 #2: ffff888067f84740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x1b19/0x1cc0 fs/bcachefs/btree_write_buffer.c:516
 #3: ffff888067fa66d0 (&c->gc_lock){.+.+}-{4:4}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197
1 lock held by syz-executor/7520:
 #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc6-syzkaller-00038-g09a0fa92e5b4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __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:234 [inline]
 watchdog+0xff6/0x1040 kernel/hung_task.c:397
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5186 Comm: klogd Not tainted 6.13.0-rc6-syzkaller-00038-g09a0fa92e5b4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:unix_dgram_connect+0x4e2/0xd80
Code: 85 a4 07 00 00 4c 89 74 24 08 41 0f bf 0e 48 8b 74 24 18 89 da e8 9e d6 ff ff 49 89 c7 48 3d 01 f0 ff ff 72 0a e8 2e 58 3a f7 <e9> 81 02 00 00 48 8b 1c 24 48 8d 83 a0 06 00 00 48 89 44 24 20 4c
RSP: 0018:ffffc900046efcc0 EFLAGS: 00000293
RAX: ffffffff8a652bf2 RBX: 000000000000006e RCX: ffff88807bba5a00
RDX: 0000000000000000 RSI: ffffffff8c0aaae0 RDI: ffffffff8c5fb020
RBP: ffffc900046efd90 R08: ffffffff901981f7 R09: 1ffffffff203303e
R10: dffffc0000000000 R11: fffffbfff203303f R12: ffff888044fc52b0
R13: 1ffff920008ddfa4 R14: ffff888077ec4804 R15: ffffffffffffff91
FS:  00007ff0f9fff380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe681f5ea60 CR3: 000000007b76e000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __sys_connect_file net/socket.c:2055 [inline]
 __sys_connect+0x28a/0x2d0 net/socket.c:2074
 __do_sys_connect net/socket.c:2080 [inline]
 __se_sys_connect net/socket.c:2077 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2077
 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: 0033:0x7ff0fa1616a4
Code: f0 ff ff 73 01 c3 48 8b 0d 81 c7 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 2a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6d 48 8b 15 55 c7 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffdcd8c0c98 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: ffffffffffffff80 RCX: 00007ff0fa1616a4
RDX: 000000000000006e RSI: 00007ff0fa1edbc0 RDI: 0000000000000003
RBP: 0000000000000002 R08: 0000000000000000 R09: 89e91a1344ef1058
R10: 0000000000000008 R11: 0000000000000246 R12: 00007ff0fa1edbc0
R13: 00007ff0fa2ef212 R14: 000000000000006f R15: 0000000000000000
 </TASK>