syzbot

INFO: task syz-executor:5500 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20992 pid:5500  tgid:5500  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 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
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
 __super_lock fs/super.c:56 [inline]
 __super_lock_excl fs/super.c:71 [inline]
 deactivate_super+0xb5/0xf0 fs/super.c:505
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd49b7f327
RSP: 002b:00007fff61494098 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fbd49b7f327
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff61494150
RBP: 00007fff61494150 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff614951d0
R13: 00007fbd49bf0134 R14: 000000000001a730 R15: 00007fff61495210
 </TASK>
INFO: task syz.2.22:5711 blocked for more than 144 seconds.
      Not tainted 6.12.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.22        state:D stack:21904 pid:5711  tgid:5675  ppid:5369   flags:0x00004006
Call Trace:
 <TASK>
 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
 jfs_flush_journal+0x72c/0xec0 fs/jfs/jfs_logmgr.c:1564
 jfs_sync_fs+0x80/0xa0 fs/jfs/super.c:684
 iterate_supers+0xc6/0x190 fs/super.c:934
 ksys_sync+0xdb/0x1c0 fs/sync.c:104
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 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: 0033:0x7f1289f7dff9
RSP: 002b:00007f128ad8e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f128a136130 RCX: 00007f1289f7dff9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f1289ff0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f128a136130 R15: 00007fff0e923058
 </TASK>
INFO: task syz.4.58:5877 blocked for more than 145 seconds.
      Not tainted 6.12.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.58        state:D stack:17552 pid:5877  tgid:5876  ppid:5410   flags:0x00004004
Call Trace:
 <TASK>
 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
 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline]
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x705/0xa40 kernel/locking/rwsem.c:1526
 __super_lock fs/super.c:58 [inline]
 super_lock+0x27c/0x400 fs/super.c:120
 super_lock_shared fs/super.c:139 [inline]
 iterate_supers+0x8c/0x190 fs/super.c:931
 ksys_sync+0xbd/0x1c0 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+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fced917dff9
RSP: 002b:00007fced9e9e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fced9335f80 RCX: 00007fced917dff9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fced91f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fced9335f80 R15: 00007ffec5af5bd8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
4 locks held by kworker/u8:6/2532:
 #0: ffff88814b35f948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff88814b35f948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: ffffc90009617d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90009617d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: ffffffff8fcbf7c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4196
 #3: ffff8880b873ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593
3 locks held by kworker/u8:7/2588:
2 locks held by getty/4973:
 #0: ffff8880321f00a0 (&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
1 lock held by syz-executor/5500:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
1 lock held by syz.2.22/5711:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.4.58/5877:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.2.102/6267:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.4.126/6440:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.0.86/6545:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.159/6685:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.4.202/6972:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.212/7055:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
1 lock held by syz.4.254/7546:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.255/7557:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
1 lock held by syz.2.269/7646:
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff88805f7ba0e0 (&type->s_umount_key#96){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
3 locks held by syz-executor/7668:
 #0: ffffffff8fcbf7c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fcbf7c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643
 #1: ffff88804f6d5428 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_open+0x22d/0x420 drivers/net/wireguard/device.c:50
 #2: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
 #2: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
1 lock held by syz-executor/7734:
 #0: ffffffff8fcbf7c8 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48c/0x2400 drivers/net/tun.c:3121
1 lock held by syz.0.291/7750:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller #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: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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7103 Comm: syz-executor Not tainted 6.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:147 [inline]
RIP: 0010:__local_bh_disable_ip+0x105/0x220 kernel/softirq.c:323
Code: ac 7e 65 8b 05 d4 4c ac 7e 44 31 f8 a9 00 ff 00 00 75 10 48 89 fb 48 8b 7c 24 18 e8 35 9b 18 00 48 89 df 48 89 fb 48 c1 eb 03 <42> 80 3c 23 00 74 21 45 89 fc 4d 89 f7 49 89 fe e8 76 ea a3 00 4c
RSP: 0018:ffffc900094f7740 EFLAGS: 00000806
RAX: 0ca276ee30333400 RBX: 1ffff9200129eef0 RCX: ffffffff9a397903
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffc900094f7780
RBP: ffffc900094f7820 R08: 0000000000000005 R09: ffffffff8a1ac25c
R10: 0000000000000003 R11: ffff88802c79bc00 R12: dffffc0000000000
R13: 1ffff9200129eeec R14: 0000000000000246 R15: 0000000000000201
FS:  000055557364b500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f951fb052d8 CR3: 0000000067d4c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:125 [inline]
 _raw_spin_lock_bh+0x1c/0x50 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 release_sock+0x30/0x1f0 net/core/sock.c:3624
 do_ip_getsockopt+0x167b/0x2940 net/ipv4/ip_sockglue.c:1732
 ip_getsockopt+0xed/0x2e0 net/ipv4/ip_sockglue.c:1765
 tcp_getsockopt+0x163/0x1c0 net/ipv4/tcp.c:4670
 do_sock_getsockopt+0x3c4/0x7e0 net/socket.c:2391
 __sys_getsockopt+0x267/0x330 net/socket.c:2420
 __do_sys_getsockopt net/socket.c:2430 [inline]
 __se_sys_getsockopt net/socket.c:2427 [inline]
 __x64_sys_getsockopt+0xb5/0xd0 net/socket.c:2427
 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: 0033:0x7f951f97fd3a
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffeafba5ca8 EFLAGS: 00000202 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f951fb052e0 RCX: 00007f951f97fd3a
RDX: 0000000000000081 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffeafba5ccc R09: 00007ffeafba60d7
R10: 00007ffeafba5cd0 R11: 0000000000000202 R12: 00007ffeafba5cd0
R13: 00007ffeafba5ccc R14: 0000000000000000 R15: 0000000000000000
 </TASK>