INFO: task syz-executor119:5836 blocked for more than 143 seconds.
Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor119 state:D stack:21192 pid:5836 tgid:5836 ppid:5834 task_flags:0x440140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x168f/0x4c70 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
__closure_sync+0x163/0x220 lib/closure.c:146
bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:256 [inline]
__bch2_write+0x324b/0x39b0 fs/bcachefs/io_write.c:1554
closure_queue include/linux/closure.h:270 [inline]
closure_call include/linux/closure.h:432 [inline]
bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:494 [inline]
bch2_writepages+0x269/0x360 fs/bcachefs/fs-io-buffered.c:677
do_writepages+0x3ae/0x7b0 mm/page-writeback.c:2656
filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
__filemap_fdatawrite_range mm/filemap.c:419 [inline]
file_write_and_wait_range+0x22c/0x330 mm/filemap.c:794
bch2_fsync+0x127/0x330 fs/bcachefs/fs-io.c:228
generic_write_sync include/linux/fs.h:2976 [inline]
bch2_write_iter+0x2822/0x2b90 fs/bcachefs/fs-io-buffered.c:1097
do_iter_readv_writev+0x56b/0x7f0 fs/read_write.c:-1
vfs_writev+0x306/0x9a0 fs/read_write.c:1055
do_pwritev fs/read_write.c:1151 [inline]
__do_sys_pwritev2 fs/read_write.c:1209 [inline]
__se_sys_pwritev2+0x179/0x290 fs/read_write.c:1200
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1e6f028e49
RSP: 002b:00007ffc16033868 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f1e6f028e49
RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00000000000016cb R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000004e7d R11: 0000000000000246 R12: 00007ffc160338c0
R13: 00007ffc160339a0 R14: 431bde82d7b634db R15: 00007f1e6f07201d
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5575:
#0: ffff888030a940a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor119/5836:
#0: ffff88806c8a2420 (sb_writers#9){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
#0: ffff88806c8a2420 (sb_writers#9){.+.+}-{0:0}, at: vfs_writev+0x274/0x9a0 fs/read_write.c:1053
2 locks held by bch-copygc/loop/5846:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:437
kthread+0x70e/0x8a0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5846 Comm: bch-copygc/loop Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:do_raw_spin_lock+0x0/0x290 kernel/locking/spinlock_debug.c:114
Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 7c 90 48 89 df e8 05 df 80 00 eb 86 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc900042ef3b8 EFLAGS: 00000096
RAX: 38baba9dc830c300 RBX: ffff88807604ed20 RCX: 38baba9dc830c300
RDX: 0000000000000000 RSI: ffffffff8d91f812 RDI: ffff88807604ed20
RBP: ffffc900042ef448 R08: 0000000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff844b2735 R12: dffffc0000000000
R13: 000000000000000d R14: 0000000000000a06 R15: 1ffff9200085de78
FS: 0000000000000000(0000) GS:ffff888126202000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcdbbf52e8 CR3: 000000000dd36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb3/0xf0 kernel/locking/spinlock.c:162
__bch2_time_stats_update+0x55/0x390 fs/bcachefs/time_stats.c:130
bch2_trans_begin+0x7bf/0x1f10 fs/bcachefs/btree_iter.c:3256
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:169 [inline]
bch2_copygc+0x50b/0x3cf0 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x8c9/0xd40 fs/bcachefs/movinggc.c:405
kthread+0x70e/0x8a0 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