INFO: task syz.1.962:16145 blocked for more than 143 seconds.
Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.962 state:D stack:26272 pid:16145 tgid:16097 ppid:15571 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
io_schedule+0x8d/0x110 kernel/sched/core.c:7742
folio_wait_bit_common+0x83f/0xf00 mm/filemap.c:1317
folio_wait_writeback+0xb0/0x100 mm/page-writeback.c:3149
__filemap_fdatawait_range+0x17e/0x2b0 mm/filemap.c:539
filemap_write_and_wait_range+0x301/0x3d0 mm/filemap.c:700
bch2_fiemap+0x1fa/0x36b0 fs/bcachefs/fs.c:1306
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x1975/0x2750 fs/ioctl.c:840
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl+0x80/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2f438e169
RSP: 002b:00007fe2f51a7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe2f45b6080 RCX: 00007fe2f438e169
RDX: 0000200000000200 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007fe2f4410a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe2f45b6080 R15: 00007fffbd067bd8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5583:
#0: ffff8880370f20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
3 locks held by kworker/u8:10/8635:
1 lock held by syz.1.962/16098:
#0: ffff88805fe16420 (sb_writers#17){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
#0: ffff88805fe16420 (sb_writers#17){.+.+}-{0:0}, at: vfs_writev+0x2d8/0xbc0 fs/read_write.c:1053
2 locks held by syz.2.1172/18205:
3 locks held by syz.5.1174/18180:
2 locks held by syz.5.1174/18213:
#0: ffff88805a4a70b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
#1: ffff8880b8723b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41f/0x7a0 kernel/sched/psi.c:987
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 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+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 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: 16138 Comm: bch-copygc/loop Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:-1
Code: e8 50 a0 e3 ff 90 0f 0b 90 90 90 31 c0 48 83 78 40 00 0f 84 b8 01 00 00 4c 89 ef 48 89 de 8b 54 24 10 48 89 e9 e8 1b 44 00 00 <45> 31 ed 85 c0 74 3b 41 f6 46 02 10 75 2e 48 8b 1c 24 48 89 ab e0
RSP: 0018:ffffc900042ee408 EFLAGS: 00000092
RAX: 0000000000000001 RBX: ffff88802eca4718 RCX: 29c5b5d100f4c300
RDX: 0000000000000000 RSI: ffff88802eca4718 RDI: ffff88802eca3c00
RBP: c2aa5bdfffee215a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000d57144e4
R13: ffff88802eca3c00 R14: ffff88802eca4738 R15: 00000000be1be08b
FS: 0000000000000000(0000) GS:ffff8881250cf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc1d89af08 CR3: 00000000338e8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd5/0x23b0 arch/x86/kernel/unwind_orc.c:479
__unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe7/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x198/0x430 mm/slub.c:4855
bch2_move_extent+0xd57/0x2680 fs/bcachefs/move.c:378
__bch2_move_data_phys+0x1b65/0x2830 fs/bcachefs/move.c:858
bch2_evacuate_bucket+0x1d9/0x2e0 fs/bcachefs/move.c:946
bch2_copygc+0x4058/0x4db0 fs/bcachefs/movinggc.c:240
bch2_copygc_thread+0x705/0xc00 fs/bcachefs/movinggc.c:398
kthread+0x7b7/0x940 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