INFO: task syz.3.660:11936 blocked for more than 143 seconds.
Tainted: G W syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.660 state:D stack:28392 pid:11936 tgid:11859 ppid:10866 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]
lock_rename fs/namei.c:3272 [inline]
do_renameat2+0x3b9/0xa80 fs/namei.c:5224
__do_sys_rename fs/namei.c:5325 [inline]
__se_sys_rename fs/namei.c:5323 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5323
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: 0033:0x7f9e9effebe9
RSP: 002b:00007f9e9d23d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f9e9f226090 RCX: 00007f9e9effebe9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000200000000280
RBP: 00007f9e9f081e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9e9f226128 R14: 00007f9e9f226090 R15: 00007ffc9d68a618
INFO: task syz.3.660:11943 blocked for more than 143 seconds.
Tainted: G W syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.660 state:D stack:28664 pid:11943 tgid:11859 ppid:10866 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
__rwbase_read_lock+0xbc/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1466 [inline]
down_read+0x127/0x1f0 kernel/locking/rwsem.c:1539
inode_lock_shared include/linux/fs.h:884 [inline]
open_last_lookups fs/namei.c:3806 [inline]
path_openat+0x8d7/0x3840 fs/namei.c:4043
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_open fs/open.c:1458 [inline]
__se_sys_open fs/open.c:1454 [inline]
__x64_sys_open+0x11e/0x150 fs/open.c:1454
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: 0033:0x7f9e9effebe9
RSP: 002b:00007f9e9d21c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f9e9f226180 RCX: 00007f9e9effebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000240
RBP: 00007f9e9f081e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9e9f226218 R14: 00007f9e9f226180 R15: 00007ffc9d68a618
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G W 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+0x70e/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: 12484 Comm: syz.0.714 Tainted: G W syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:resched_offsets_ok kernel/sched/core.c:8904 [inline]
RIP: 0010:__might_resched+0xe3/0x5d0 kernel/sched/core.c:8921
Code: 00 75 1f c6 05 85 d8 75 0d 01 48 c7 c7 40 49 0a 8b be d7 22 00 00 48 c7 c2 c0 52 0a 8b e8 85 cc 0a 00 65 44 8b 25 ad 61 64 10 <41> 81 e4 ff ff ff 7f 65 48 8b 14 25 08 b0 f5 91 4c 8d b2 44 04 00
RSP: 0018:ffffc900050ee740 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92000a1dcf0 RCX: 99797c254cb9ac00
RDX: 0000000000000000 RSI: 0000000000000030 RDI: ffffffff8b0b0b00
RBP: ffffc900050ee850 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88803ae87926 R11: ffffed10075d0f27 R12: 0000000080000000
R13: dffffc0000000000 R14: ffff88802654d940 R15: ffff88802654dd84
FS: 00007fc894fe66c0(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c462fe650 CR3: 0000000032d0a000 CR4: 00000000003526f0
Call Trace:
__rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
rt_spin_lock+0xc7/0x2c0 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:44 [inline]
__bch2_time_stats_update+0x57/0x370 fs/bcachefs/time_stats.c:130
bch2_time_stats_update fs/bcachefs/time_stats.h:118 [inline]
bch2_btree_node_mem_alloc+0xcbd/0x1820 fs/bcachefs/btree_cache.c:856
__bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:302 [inline]
bch2_btree_reserve_get+0x2f3/0x1820 fs/bcachefs/btree_update_interior.c:534
bch2_btree_update_start+0x147b/0x1de0 fs/bcachefs/btree_update_interior.c:1270
bch2_btree_split_leaf+0x14b/0x8e0 fs/bcachefs/btree_update_interior.c:1921
bch2_trans_commit_error+0x1b7/0x1130 fs/bcachefs/btree_trans_commit.c:914
__bch2_trans_commit+0x1bb5/0x8870 fs/bcachefs/btree_trans_commit.c:1104
bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
__bch2_create+0x887/0xb90 fs/bcachefs/fs.c:593
bch2_tmpfile+0x95/0x170 fs/bcachefs/fs.c:1249
vfs_tmpfile+0x3a0/0x870 fs/namei.c:3938
do_tmpfile+0xd3/0x240 fs/namei.c:4003
path_openat+0x3106/0x3840 fs/namei.c:4037
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
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: 0033:0x7fc896d7ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fc894fe6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc896fa5fa0 RCX: 00007fc896d7ebe9
RDX: 0000000000411203 RSI: 0000200000000240 RDI: ffffffffffffff9c
RBP: 00007fc896e01e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000070 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc896fa6038 R14: 00007fc896fa5fa0 R15: 00007fff1d4d7ef8