INFO: task syz.3.12:5954 blocked for more than 143 seconds.
      Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.12        state:D stack:19952 pid:5954  tgid:5953  ppid:5819   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1ac3/0x5090 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_timeout+0xb1/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x360/0x630 kernel/sched/completion.c:148
 kthread_stop+0x1a1/0x640 kernel/kthread.c:791
 bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:413
 __bch2_fs_read_only+0x47/0x450 fs/bcachefs/super.c:265
 bch2_fs_read_only+0xc80/0x1360 fs/bcachefs/super.c:356
 bch2_remount fs/bcachefs/fs.c:2023 [inline]
 bch2_fs_reconfigure+0x1fa/0x390 fs/bcachefs/fs.c:2355
 reconfigure_super+0x43a/0x870 fs/super.c:1083
 do_remount fs/namespace.c:3362 [inline]
 path_mount+0xc25/0xfa0 fs/namespace.c:4197
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f022af8d169
RSP: 002b:00007f0228df6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f022b1a5fa0 RCX: 00007f022af8d169
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f022b00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f022b1a5fa0 R15: 00007ffcc1b91718
 </TASK>
INFO: task syz.2.17:5995 blocked for more than 143 seconds.
      Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.17        state:D stack:24776 pid:5995  tgid:5994  ppid:5822   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1ac3/0x5090 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6896
 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+0x74c/0xae0 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+0xc2/0x1d0 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f416478d169
RSP: 002b:00007f4165513038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f41649a5fa0 RCX: 00007f416478d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f41649a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f41649a5fa0 R15: 00007fff77149218
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8eb3a860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8eb3a860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8eb3a860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
3 locks held by kworker/u8:6/2984:
2 locks held by getty/5587:
 #0: ffff888035e320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000330b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
4 locks held by kworker/0:6/5916:
 #0: ffff8880b8639958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:595
 #1: ffff8880b8623b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41f/0x7a0 kernel/sched/psi.c:987
 #2: ffff8880b8625558 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1046 [inline]
 #2: ffff8880b8625558 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x24c/0x10f0 kernel/time/timer.c:1127
 #3: ffffffff9a66e738 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x190/0x5c0 lib/debugobjects.c:818
2 locks held by syz.3.12/5954:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: do_remount fs/namespace.c:3359 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: path_mount+0xbde/0xfa0 fs/namespace.c:4197
 #1: ffff888052100278 (&c->state_lock){+.+.}-{4:4}, at: bch2_remount fs/bcachefs/fs.c:2020 [inline]
 #1: ffff888052100278 (&c->state_lock){+.+.}-{4:4}, at: bch2_fs_reconfigure+0x18b/0x390 fs/bcachefs/fs.c:2355
1 lock held by syz.2.17/5995:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.5.71/6531:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.1.83/6677:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.7.104/7028:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.128/7325:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.6.159/7746:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.0.172/7872:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.1.314/8881:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.8.343/9099:
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880212a80e0 (&type->s_umount_key#86){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by dhcpcd-run-hook/9178:
 #0: ffff8880b8639958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:595

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0x1058/0x10a0 kernel/hung_task.c:399
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5488 Comm: dhcpcd Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:memset+0x0/0x20 arch/x86/lib/memset_64.S:32
Code: 89 54 17 fe eb 0c 48 83 fa 01 72 06 44 8a 1e 44 88 1f c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa eb 2a 49 89 f9 40 88 f0 48 89 d1 f3 aa 4c 89 c8 c3 cc
RSP: 0018:ffffc900039ff348 EFLAGS: 00000202
RAX: ffffc900039ff401 RBX: ffffc900039ff4b8 RCX: ffffffff816df79b
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc900039ff4d0
RBP: dffffc0000000000 R08: ffffc900039ff4df R09: 1ffff9200073fe9b
R10: dffffc0000000000 R11: fffff5200073fe9c R12: ffffc90003a00000
R13: ffffc900039ff480 R14: ffffffff816422f7 R15: ffffc900039ff4d0
FS:  00007f9b0d849740(0000) GS:ffff888125259000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005562019ac131 CR3: 000000002433c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 unwind_next_frame+0xd0b/0x22f0 arch/x86/kernel/unwind_orc.c:592
 __unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe7/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2376 [inline]
 slab_free mm/slub.c:4633 [inline]
 kfree+0x198/0x430 mm/slub.c:4832
 skb_kfree_head net/core/skbuff.c:996 [inline]
 skb_free_head net/core/skbuff.c:1008 [inline]
 skb_release_data+0x6a3/0x8b0 net/core/skbuff.c:1035
 skb_release_all net/core/skbuff.c:1100 [inline]
 __kfree_skb net/core/skbuff.c:1114 [inline]
 consume_skb+0x9f/0xf0 net/core/skbuff.c:1346
 netlink_recvmsg+0x620/0x1180 net/netlink/af_netlink.c:1960
 sock_recvmsg_nosec net/socket.c:1023 [inline]
 sock_recvmsg+0x22f/0x280 net/socket.c:1045
 ____sys_recvmsg+0x1c8/0x480 net/socket.c:2793
 ___sys_recvmsg net/socket.c:2835 [inline]
 __sys_recvmsg+0x2a5/0x3a0 net/socket.c:2868
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b0d92191e
Code: ff 89 ef 48 89 04 24 e8 4f 57 f9 ff 48 8b 04 24 48 83 c4 30 5d c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 21 b8 2f 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 70 48 8b 15 db c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fff9eff1c08 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007fff9eff2d30 RCX: 00007f9b0d92191e
RDX: 0000000000000000 RSI: 00007fff9eff2c50 RDI: 0000000000000011
RBP: 00007fff9eff2cc0 R08: 0000000000000000 R09: 0000000000000100
R10: 00000000000000c8 R11: 0000000000000246 R12: 0000000000000b78
R13: 00007fff9eff2c34 R14: 00007fff9eff2c50 R15: 00007fff9eff2c40
 </TASK>