INFO: task syz.4.2512:18345 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2512 state:D stack:19840 pid:18345 tgid:18325 ppid:10464 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
__bch2_two_state_lock+0x1ea/0x370 fs/bcachefs/two_state_shared_lock.c:7
bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline]
bch2_readahead+0x94f/0x1100 fs/bcachefs/fs-io-buffered.c:296
read_pages+0x17a/0x580 mm/readahead.c:160
page_cache_ra_order+0x8ca/0xd40 mm/readahead.c:512
filemap_readahead mm/filemap.c:2572 [inline]
filemap_get_pages+0xb22/0x1ea0 mm/filemap.c:2617
filemap_splice_read+0x581/0xc60 mm/filemap.c:2991
do_splice_read fs/splice.c:982 [inline]
splice_direct_to_actor+0x4a9/0xcc0 fs/splice.c:1086
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1230
do_sendfile+0x4da/0x7e0 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: 0033:0x7f8340d8ebe9
RSP: 002b:00007f8341c23038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f8340fb6090 RCX: 00007f8340d8ebe9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006
RBP: 00007f8340e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8340fb6128 R14: 00007f8340fb6090 R15: 00007ffcae7c0b78
INFO: task syz.4.2512:18348 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2512 state:D stack:25920 pid:18348 tgid:18325 ppid:10464 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
io_schedule+0x80/0xd0 kernel/sched/core.c:7903
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1133 [inline]
truncate_inode_pages_range+0xa77/0xda0 mm/truncate.c:433
truncate_inode_pages mm/truncate.c:460 [inline]
truncate_pagecache mm/truncate.c:769 [inline]
truncate_setsize+0xcf/0xf0 mm/truncate.c:794
bchfs_truncate+0x622/0xc20 fs/bcachefs/fs-io.c:488
notify_change+0xb36/0xe40 fs/attr.c:552
do_truncate+0x1a4/0x220 fs/open.c:68
handle_truncate fs/namei.c:3508 [inline]
do_open fs/namei.c:3891 [inline]
path_openat+0x306c/0x3830 fs/namei.c:4046
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: 0033:0x7f8340d8ebe9
RSP: 002b:00007f8341be1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f8340fb6270 RCX: 00007f8340d8ebe9
RDX: 0000000000000000 RSI: 000000000014927e RDI: 0000200000000180
RBP: 00007f8340e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8340fb6308 R14: 00007f8340fb6270 R15: 00007ffcae7c0b78
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5961 Comm: kworker/1:6 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: rcu_gp process_srcu
RIP: 0010:rdtsc_ordered arch/x86/include/asm/tsc.h:57 [inline]
RIP: 0010:delay_tsc+0x71/0xc0 arch/x86/lib/delay.c:72
Code: 00 00 e8 72 a8 17 f6 65 8b 05 3b fb 27 07 85 c0 74 1c f3 90 bf 01 00 00 00 e8 ab a6 17 f6 e8 16 3c 01 00 39 c5 75 0e 0f 01 f9 <66> 90 eb bd e8 d6 71 bb f5 eb dd 4c 29 fb e8 fc 3b 01 00 89 c5 0f
RSP: 0018:ffffc9000489f8c0 EFLAGS: 00000246
RAX: 0000000077acaf47 RBX: 0000000000002fdb RCX: 0000000000000001
RDX: 0000000000000328 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000001 R08: ffff8880b8734647 R09: 1ffff110170e68c8
R10: dffffc0000000000 R11: ffffffff8b7854a0 R12: 0000000000002aff
R13: 0000000000000002 R14: 0000032877ac89ab R15: 00000000000024f1
FS: 0000000000000000(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555699c0608 CR3: 0000000074f89000 CR4: 0000000000350ef0
Call Trace:
udelay include/asm-generic/delay.h:64 [inline]
try_check_zero+0x5dd/0x670 kernel/rcu/srcutree.c:1118
srcu_advance_state kernel/rcu/srcutree.c:1754 [inline]
process_srcu+0x2c6/0x1410 kernel/rcu/srcutree.c:1863
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