INFO: task syz-executor413:5848 blocked for more than 143 seconds.
Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor413 state:D stack:18128 pid:5848 tgid:5848 ppid:5847 task_flags:0x400140 flags:0x00004006
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
__closure_sync+0x1c0/0x2a0 lib/closure.c:146
bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:254 [inline]
bch2_btree_update_start+0x12bd/0x16c0 fs/bcachefs/btree_update_interior.c:1251
bch2_btree_split_leaf+0x12d/0x8a0 fs/bcachefs/btree_update_interior.c:1864
bch2_trans_commit_error+0x1b3/0x1480 fs/bcachefs/btree_trans_commit.c:904
__bch2_trans_commit+0x8886/0x9da0 fs/bcachefs/btree_trans_commit.c:1069
bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline]
__bch2_create+0xa79/0xf40 fs/bcachefs/fs.c:576
bch2_mknod fs/bcachefs/fs.c:728 [inline]
bch2_create+0xec/0x1c0 fs/bcachefs/fs.c:742
lookup_open fs/namei.c:3701 [inline]
open_last_lookups fs/namei.c:3800 [inline]
path_openat+0x194b/0x35d0 fs/namei.c:4036
do_filp_open+0x284/0x4e0 fs/namei.c:4066
do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x249/0x2a0 fs/open.c:1455
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: 0033:0x7f3ce6fd2b59
RSP: 002b:00007ffc331b4b18 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000200000000080 RCX: 00007f3ce6fd2b59
RDX: 0000000000105042 RSI: 0000200000000080 RDI: 00000000ffffff9c
RBP: 0031656c69662f2e R08: 0000555566a7d4c0 R09: 0000555566a7d4c0
R10: 00000000000001db R11: 0000000000000246 R12: 00007ffc331b4b40
R13: 00007ffc331b4d68 R14: 431bde82d7b634db R15: 00007f3ce701b03b
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/5587:
#0: ffff888035a8a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000334b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
5 locks held by syz-executor413/5848:
#0: ffff88807c380420 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
#1: ffff8880746c0148 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff8880746c0148 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:3797 [inline]
#1: ffff8880746c0148 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: path_openat+0x8af/0x35d0 fs/namei.c:4036
#2: ffff8880746c0530 (&inode->ei_update_lock#4){+.+.}-{4:4}, at: __bch2_create+0x359/0xf40 fs/bcachefs/fs.c:550
#3: ffff888076204228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#3: ffff888076204228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#3: ffff888076204228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0x9a/0x1a0 fs/bcachefs/btree_iter.c:3199
#4: ffff888076226590 (&c->gc_lock){.+.+}-{4:4}, at: bch2_btree_update_start+0x68a/0x16c0 fs/bcachefs/btree_update_interior.c:1179
1 lock held by bch-copygc/loop/5858:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5858 Comm: bch-copygc/loop Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x2f/0x90 kernel/kcov.c:300
Code: 8b 04 24 65 48 8b 14 25 08 10 65 93 65 8b 05 b8 50 a2 11 25 00 01 ff 00 74 10 3d 00 01 00 00 75 5b 83 ba 3c 16 00 00 00 74 52 <8b> 82 18 16 00 00 83 f8 03 75 47 48 8b 8a 20 16 00 00 44 8b 8a 1c
RSP: 0018:ffffc900041deb40 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888035870000
RDX: ffff888035870000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff9200083be01 R08: ffffffff84771a7b R09: 0000000000000000
R10: ffffc900041deb00 R11: fffff5200083bd62 R12: ffffc900041df000
R13: dffffc0000000000 R14: ffffc900041df008 R15: ffffc900041df00e
FS: 0000000000000000(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb5ad8108 CR3: 000000000eb38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
bch2_io_opts_fixups fs/bcachefs/opts.h:656 [inline]
bch2_inode_opts_get+0x95b/0x1250 fs/bcachefs/inode.c:1192
bch2_move_get_io_opts_one+0x646/0xa10 fs/bcachefs/move.c:480
__bch2_move_data_phys+0x1241/0x2830 fs/bcachefs/move.c:831
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
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.713 msecs