INFO: task kworker/u8:0:12 blocked for more than 143 seconds.
Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:0 state:D stack:20904 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-bcachefs-27)
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x805/0x10c0 kernel/locking/mutex.c:746
bch2_vfs_write_inode+0x69/0xc0 fs/bcachefs/fs.c:1854
write_inode fs/fs-writeback.c:1525 [inline]
__writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745
writeback_sb_inodes+0x822/0x1360 fs/fs-writeback.c:1976
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2047
wb_writeback+0x429/0xb90 fs/fs-writeback.c:2158
wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
wb_do_writeback fs/fs-writeback.c:2315 [inline]
wb_workfn+0xbbc/0x10b0 fs/fs-writeback.c:2343
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 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
INFO: task syz.1.159:7511 blocked for more than 143 seconds.
Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.159 state:D stack:18128 pid:7511 tgid:7450 ppid:5822 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
__closure_sync+0x1c0/0x2a0 lib/closure.c:146
bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:254 [inline]
bch2_btree_update_start+0x12bd/0x16c0 fs/bcachefs/btree_update_interior.c:1251
bch2_btree_split_leaf+0x12d/0x8a0 fs/bcachefs/btree_update_interior.c:1864
bch2_trans_commit_error+0x1b3/0x1480 fs/bcachefs/btree_trans_commit.c:904
__bch2_trans_commit+0x8886/0x9da0 fs/bcachefs/btree_trans_commit.c:1069
bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline]
__bch2_create+0xa79/0xf40 fs/bcachefs/fs.c:576
bch2_mknod fs/bcachefs/fs.c:728 [inline]
bch2_create+0xec/0x1c0 fs/bcachefs/fs.c:742
lookup_open fs/namei.c:3701 [inline]
open_last_lookups fs/namei.c:3800 [inline]
path_openat+0x194b/0x35d0 fs/namei.c:4036
do_filp_open+0x284/0x4e0 fs/namei.c:4066
do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x249/0x2a0 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe41f8e169
RSP: 002b:00007efe3fdd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007efe421b6080 RCX: 00007efe41f8e169
RDX: 000000000000275a RSI: 00002000000001c0 RDI: ffffffffffffff9c
RBP: 00007efe42010a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007efe421b6080 R15: 00007fff1c425c28
Showing all locks held in the system:
4 locks held by kworker/u8:0/12:
#0: ffff88801f2cd148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801f2cd148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc90000117c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000117c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
#3: ffff888078b5d120 (&inode->ei_update_lock){+.+.}-{4:4}, at: bch2_vfs_write_inode+0x69/0xc0 fs/bcachefs/fs.c:1854
1 lock held by khungtaskd/31:
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
3 locks held by kworker/u8:3/54:
5 locks held by kworker/u9:0/56:
2 locks held by kworker/u8:5/982:
#0: ffff888147ac1948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff888147ac1948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc90003907c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90003907c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
2 locks held by getty/5582:
#0: ffff88803691a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900033262f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
5 locks held by syz.1.159/7511:
#0: ffff888079c2c420 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
#1: ffff888078b5cd38 (&sb->s_type->i_mutex_key#26){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff888078b5cd38 (&sb->s_type->i_mutex_key#26){++++}-{4:4}, at: open_last_lookups fs/namei.c:3797 [inline]
#1: ffff888078b5cd38 (&sb->s_type->i_mutex_key#26){++++}-{4:4}, at: path_openat+0x8af/0x35d0 fs/namei.c:4036
#2: ffff888078b5d120 (&inode->ei_update_lock){+.+.}-{4:4}, at: __bch2_create+0x359/0xf40 fs/bcachefs/fs.c:550
#3: ffff88804e904228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#3: ffff88804e904228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#3: ffff88804e904228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0x9a/0x1a0 fs/bcachefs/btree_iter.c:3199
#4: ffff88804e926590 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x68a/0x16c0 fs/bcachefs/btree_update_interior.c:1179
2 locks held by bch-copygc/loop/7509:
1 lock held by syz-executor/8223:
2 locks held by syz.7.352/9563:
#0: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888079c2a7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
#1: ffff888079c2a7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x270/0xb50 fs/fs-writeback.c:2831
2 locks held by syz.7.352/9565:
#0: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888079c2a7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
#1: ffff888079c2a7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x270/0xb50 fs/fs-writeback.c:2831
2 locks held by syz-executor/9879:
2 locks held by syz.4.420/10394:
#0: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888079c2c0e0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888079c2a7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline]
#1: ffff888079c2a7d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x270/0xb50 fs/fs-writeback.c:2831
1 lock held by syz.3.447/10628:
5 locks held by syz.2.449/10667:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__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:274 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 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
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10704 Comm: syz-executor Not tainted 6.15.0-rc2-syzkaller-00471-g119009db2674 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:lock_acquire+0x6f/0x2f0 kernel/locking/lockdep.c:5831
Code: f8 08 0f 83 b4 01 00 00 89 c0 48 0f a3 05 a9 53 c0 0e 73 16 e8 52 c6 09 00 84 c0 75 0d f6 05 9d 41 aa 0e 01 0f 84 9b 01 00 00 <83> 3d 6a 82 c0 0e 00 0f 84 e6 00 00 00 48 8b 74 24 70 48 89 df e8
RSP: 0018:ffffc900052bf608 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8ed3df20 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8ca0e160 RDI: ffffffff8ca0e120
RBP: ffffffff93651020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555577fbb500(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68e1ae5000 CR3: 000000005101c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
is_bpf_text_address+0x46/0x2a0 kernel/bpf/core.c:772
kernel_text_address+0xa7/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xff/0x150 arch/x86/kernel/stacktrace.c:26
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
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4372
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
ref_tracker_alloc+0x159/0x4c0 lib/ref_tracker.c:203
__netns_tracker_alloc include/net/net_namespace.h:357 [inline]
netns_tracker_alloc include/net/net_namespace.h:366 [inline]
get_net_track include/net/net_namespace.h:383 [inline]
sk_alloc+0x1ac/0x370 net/core/sock.c:2266
unix_create1+0xb4/0x7a0 net/unix/af_unix.c:-1
unix_create+0x14e/0x200 net/unix/af_unix.c:1082
__sock_create+0x4c0/0xa30 net/socket.c:1541
sock_create net/socket.c:1599 [inline]
__sys_socket_create net/socket.c:1636 [inline]
__sys_socket+0x14d/0x3c0 net/socket.c:1683
__do_sys_socket net/socket.c:1697 [inline]
__se_sys_socket net/socket.c:1695 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1695
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f68e0d90087
Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc10780548 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007ffc10780680 RCX: 00007f68e0d90087
RDX: 0000000000000000 RSI: 0000000000080002 RDI: 0000000000000001
RBP: 00007ffc10780560 R08: 000000000000000a R09: 00007ffc10780658
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f68e1ae4620 R14: 0000000000000005 R15: 0000000000000000