syzbot

INFO: task syz-executor187:5900 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor187 state:D stack:27696 pid:5900  tgid:5900  ppid:5850   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0xe55/0x5740 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 super_lock+0x2bb/0x3f0 fs/super.c:114
 super_lock_shared fs/super.c:139 [inline]
 iterate_supers+0xb9/0x240 fs/super.c:931
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe97a5a629
RSP: 002b:00007ffe43f180d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fbe97aa8038 RCX: 00007fbe97a5a629
RDX: 00007fbe97a59650 RSI: 0000000000000012 RDI: 00007fbe97aa8046
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fbe97aa820c
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbe97aa84a0
R13: 00007fbe97aa807c R14: 00007ffe43f18110 R15: 0000000000000000
 </TASK>
INFO: task syz-executor187:5901 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor187 state:D stack:28384 pid:5901  tgid:5901  ppid:5849   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0xe55/0x5740 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 super_lock+0x2bb/0x3f0 fs/super.c:114
 super_lock_shared fs/super.c:139 [inline]
 iterate_supers+0xb9/0x240 fs/super.c:931
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe97a5a629
RSP: 002b:00007ffe43f180d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fbe97aa8038 RCX: 00007fbe97a5a629
RDX: 00007fbe97a59650 RSI: 0000000000000012 RDI: 00007fbe97aa8046
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fbe97aa820c
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbe97aa84a0
R13: 00007fbe97aa807c R14: 00007ffe43f18110 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720
2 locks held by getty/5587:
 #0: ffff888036bd20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz-executor187/5893:
 #0: ffff88807dd6a0e0 (&type->s_umount_key#66/1){+.+.}-{3:3}, at: alloc_super+0x23d/0xbd0 fs/super.c:344
1 lock held by syz-executor187/5894:
 #0: ffff888072b720e0 (&type->s_umount_key#66/1){+.+.}-{3:3}, at: alloc_super+0x23d/0xbd0 fs/super.c:344
1 lock held by syz-executor187/5895:
 #0: ffff8880319960e0 (&type->s_umount_key#66/1){+.+.}-{3:3}, at: alloc_super+0x23d/0xbd0 fs/super.c:344

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf0c/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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: 4352 Comm: kworker/u8:9 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:227 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:hlock_class+0x4e/0x130 kernel/locking/lockdep.c:228
Code: 8e da 00 00 00 0f b7 5b 20 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 ec e2 96 e8 72 60 85 00 <48> 0f a3 1d 5a 36 79 15 73 13 48 69 c3 c8 00 00 00 5b 48 05 60 f0
RSP: 0018:ffffc9000edef800 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000022 RCX: ffffffff8169b5de
RDX: fffffbfff2dc5d89 RSI: 0000000000000008 RDI: ffffffff96e2ec40
RBP: ffffc9000edef948 R08: 0000000000000000 R09: fffffbfff2dc5d88
R10: ffffffff96e2ec47 R11: 0000000000000002 R12: ffff888034e32440
R13: 0000000000000200 R14: 0000000000000009 R15: 1ffff92001dbdf08
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056304821d600 CR3: 000000000df7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 mark_lock+0xb5/0xc60 kernel/locking/lockdep.c:4703
 mark_usage kernel/locking/lockdep.c:4646 [inline]
 __lock_acquire+0x906/0x3ce0 kernel/locking/lockdep.c:5156
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0x16a/0x1060 net/batman-adv/network-coding.c:719
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>