INFO: task syz.4.115:6824 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc1-syzkaller-00199-gdfd4b508c8c6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.115 state:D stack:14632 pid:6824 tgid:6823 ppid:5827 task_flags:0x400140 flags:0x00004006
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 include/linux/fs.h:869 [inline]
bch2_direct_write+0x19b/0x2cf0 fs/bcachefs/fs-io-direct.c:613
bch2_write_iter+0x192/0x2ba0 fs/bcachefs/fs-io-buffered.c:1064
iter_file_splice_write+0x9cb/0x10b0 fs/splice.c:738
do_splice_from fs/splice.c:935 [inline]
direct_splice_actor+0x104/0x160 fs/splice.c:1158
splice_direct_to_actor+0x5b3/0xcd0 fs/splice.c:1102
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x187/0x270 fs/splice.c:1227
do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1431 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
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: 0033:0x7fbec1b4ebe9
RSP: 002b:00007fbebfdb6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fbec1d75fa0 RCX: 00007fbec1b4ebe9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007
RBP: 00007fbec1bd1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbec1d76038 R14: 00007fbec1d75fa0 R15: 00007ffce246ac78
INFO: task syz.4.115:6847 blocked for more than 143 seconds.
Tainted: G W 6.17.0-rc1-syzkaller-00199-gdfd4b508c8c6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.115 state:D stack:29352 pid:6847 tgid:6823 ppid:5827 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 include/linux/fs.h:869 [inline]
bch2_fallocate_dispatch+0x111/0x410 fs/bcachefs/fs-io.c:827
vfs_fallocate+0x672/0x7f0 fs/open.c:342
ksys_fallocate fs/open.c:366 [inline]
__do_sys_fallocate fs/open.c:371 [inline]
__se_sys_fallocate fs/open.c:369 [inline]
__x64_sys_fallocate+0xc0/0x110 fs/open.c:369
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: 0033:0x7fbec1b4ebe9
RSP: 002b:00007fbebfd74038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fbec1d76180 RCX: 00007fbec1b4ebe9
RDX: 0000000000004000 RSI: 0000000000000008 RDI: 0000000000000009
RBP: 00007fbec1bd1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbec1d76218 R14: 00007fbec1d76180 R15: 00007ffce246ac78
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Tainted: G W 6.17.0-rc1-syzkaller-00199-gdfd4b508c8c6 #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: 9375 Comm: syz.0.399 Tainted: G W 6.17.0-rc1-syzkaller-00199-gdfd4b508c8c6 #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:unwind_next_frame+0x17cc/0x2390 arch/x86/kernel/unwind_orc.c:-1
Code: c1 e8 03 0f b6 04 28 84 c0 0f 85 0e 0b 00 00 49 0f bf 04 24 48 01 c6 4c 89 f7 48 89 da e8 4c 0e 00 00 84 c0 0f 84 47 01 00 00 <48> bd 00 00 00 00 00 fc ff df 48 8b 44 24 20 0f b6 04 28 84 c0 0f
RSP: 0018:ffffc900059872d8 EFLAGS: 00000202
RAX: 1ffff92000b30e01 RBX: ffffffff8fb56664 RCX: 0000000000000001
RDX: ffffc900059873e8 RSI: dffffc0000000000 RDI: ffffc90005987df0
RBP: dffffc0000000000 R08: ffffc90005987df0 R09: 0000000000000000
R10: ffffc900059873f8 R11: fffff52000b30e81 R12: ffffc90005987df0
R13: ffffc900059873f8 R14: ffffc900059873a8 R15: 1ffffffff1f6accc
FS: 00007fc9f3b0e6c0(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd32dfca000 CR3: 0000000050b1c000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:330 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4180 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_noprof+0x143/0x310 mm/slub.c:4236
f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2951 [inline]
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2961 [inline]
add_free_nid+0xce/0x6e0 fs/f2fs/node.c:2353
scan_nat_page fs/f2fs/node.c:2454 [inline]
__f2fs_build_free_nids fs/f2fs/node.c:2560 [inline]
f2fs_build_free_nids+0xc5f/0x11c0 fs/f2fs/node.c:2606
f2fs_fill_super+0x4457/0x6fa0 fs/f2fs/super.c:5001
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
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: 0033:0x7fc9f58b038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 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:00007fc9f3b0de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc9f3b0def0 RCX: 00007fc9f58b038a
RDX: 0000200000000140 RSI: 0000200000000240 RDI: 00007fc9f3b0deb0
RBP: 0000200000000140 R08: 00007fc9f3b0def0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000240
R13: 00007fc9f3b0deb0 R14: 0000000000005505 R15: 0000200000000380