INFO: task syz.2.47:6639 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.47 state:D stack:25800 pid:6639 tgid:6633 ppid:5892 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x81/0xe0 kernel/sched/core.c:7903
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1133 [inline]
release_metapage+0x103/0xab0 fs/jfs/jfs_metapage.c:870
discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
__get_metapage+0x9a0/0xde0 fs/jfs/jfs_metapage.c:753
dtSplitPage+0x7f8/0x3b20 fs/jfs/jfs_dtree.c:1471
dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
dtInsert+0x109b/0x5f40 fs/jfs/jfs_dtree.c:871
jfs_mkdir+0x6ec/0xa70 fs/jfs/namei.c:270
vfs_mkdir+0x306/0x510 fs/namei.c:4366
do_mkdirat+0x247/0x590 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4414
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbadbb4d457
RSP: 002b:00007fbad9d8ce68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fbad9d8cef0 RCX: 00007fbadbb4d457
RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007fbad9d8ceb0 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz.2.47:6640 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.47 state:D stack:28928 pid:6640 tgid:6633 ppid:5892 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1e04/0x25e0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244
inode_lock_nested include/linux/fs.h:914 [inline]
filename_create+0x1f8/0x3c0 fs/namei.c:4139
do_mkdirat+0xa0/0x590 fs/namei.c:4391
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4414
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbadbb4d457
RSP: 002b:00007fbad9d6be68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fbad9d6bef0 RCX: 00007fbadbb4d457
RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007fbad9d6beb0 R14: 0000000000000000 R15: 0000000000000000
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G W 6.17.0-rc2-syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 5890 Comm: kworker/u9:3 Tainted: G W 6.17.0-rc2-syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bcachefs bch2_write_point_do_index_updates
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0xa0 kernel/kcov.c:315
Code: 7c 0a 10 48 89 74 0a 18 48 89 44 0a 20 e9 04 60 3b 09 cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> 8b 04 24 65 48 8b 0c 25 08 b0 f5 91 65 44 8b 05 27 50 37 10 41
RSP: 0018:ffffc9000483ed90 EFLAGS: 00000293
RAX: ffffffff8415123f RBX: 0000000000034002 RCX: ffff888027d89dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000040
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc9000483ee60 R11: fffff52000907dd0 R12: 000000000000003f
R13: 0000000000000000 R14: 0000000000068005 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b3bacc000 CR3: 0000000050924000 CR4: 00000000003526f0
Call Trace:
get_inc_field fs/bcachefs/bkey.c:173 [inline]
__bch2_bkey_unpack_key+0x97c/0xe10 fs/bcachefs/bkey.c:284
__bkey_unpack_key_format_checked fs/bcachefs/bkey.h:407 [inline]
__bkey_unpack_key fs/bcachefs/bkey.h:426 [inline]
bkey_disassemble fs/bcachefs/bkey.h:467 [inline]
bch2_btree_path_peek_slot+0x49d/0xfe0 fs/bcachefs/btree_iter.c:1845
bch2_btree_path_peek_slot_exact fs/bcachefs/btree_iter.h:266 [inline]
verify_update_old_key+0x118/0x790 fs/bcachefs/btree_trans_commit.c:51
run_one_trans_trigger fs/bcachefs/btree_trans_commit.c:490 [inline]
bch2_trans_commit_run_triggers fs/bcachefs/btree_trans_commit.c:554 [inline]
__bch2_trans_commit+0x361/0x8870 fs/bcachefs/btree_trans_commit.c:1023
bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
__bch2_data_update_index_update+0x425d/0x4f70 fs/bcachefs/data_update.c:456
bch2_data_update_index_update+0x65/0xa0 fs/bcachefs/data_update.c:502
__bch2_write_index+0x1004/0x1930 fs/bcachefs/io_write.c:607
bch2_write_point_do_index_updates+0x43f/0x570 fs/bcachefs/io_write.c:718
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245