INFO: task syz.1.2695:32187 blocked for more than 143 seconds.
Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2695 state:D stack:26952 pid:32187 tgid:32154 ppid:31546 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
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:867 [inline]
vfs_link+0x3b2/0x6e0 fs/namei.c:4838
do_linkat+0x55b/0x700 fs/namei.c:4917
__do_sys_link fs/namei.c:4951 [inline]
__se_sys_link fs/namei.c:4949 [inline]
__x64_sys_link+0x82/0x90 fs/namei.c:4949
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: 0033:0x7ff22398e969
RSP: 002b:00007ff2248b4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007ff223bb6080 RCX: 00007ff22398e969
RDX: 0000000000000000 RSI: 0000200000000300 RDI: 0000200000000200
RBP: 00007ff223a10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff223bb6080 R15: 00007ffee49f2648
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/5580:
#0: ffff88803202a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
5 locks held by syz.1.2695/32155:
#0: ffff888069ee8420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
#1: ffff88807882d4d0 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#1: ffff88807882d4d0 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: do_truncate+0x20e/0x310 fs/open.c:63
#2: ffff8880ab400a70 (&c->snapshot_create_lock){.+.+}-{4:4}, at: bch2_truncate+0x1ae/0x340 fs/bcachefs/io_misc.c:295
#3: ffff8880ab404228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#3: ffff8880ab404228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#3: ffff8880ab404228 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7ed/0xd40 fs/bcachefs/btree_iter.c:3382
#4: ffff8880ab426590 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x68a/0x16c0 fs/bcachefs/btree_update_interior.c:1179
3 locks held by syz.1.2695/32187:
#0: ffff888069ee8420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556
#1: ffff88807882eb98 (&sb->s_type->i_mutex_key#19/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline]
#1: ffff88807882eb98 (&sb->s_type->i_mutex_key#19/1){+.+.}-{4:4}, at: filename_create+0x262/0x510 fs/namei.c:4132
#2: ffff88807882d4d0 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#2: ffff88807882d4d0 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: vfs_link+0x3b2/0x6e0 fs/namei.c:4838
1 lock held by bch-copygc/loop/32185:
1 lock held by dhcpcd-run-hook/2233:
#0: ffff8880b8739998 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:605
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #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: 24471 Comm: kworker/u8:14 Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:insn_get_prefixes+0x9f2/0x1ac0 arch/x86/lib/insn.c:181
Code: 07 00 00 48 89 e8 48 c1 e8 03 42 0f b6 04 30 84 c0 4d 89 e7 0f 85 7a 0a 00 00 44 0f b6 75 00 41 0f b6 ee 89 ef e8 5e 97 ff ff <89> c3 83 e3 1f 48 89 df 48 c7 c6 10 03 46 90 e8 fa bb 9b f5 83 fb
RSP: 0018:ffffc900045f7550 EFLAGS: 00000246
RAX: 0000000000016000 RBX: ffffc900045f78e0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000000000e9
RBP: 00000000000000e9 R08: ffffffff8c270562 R09: 0000000000000000
R10: ffffc900045f7880 R11: fffff520008bef1e R12: ffffc900045f7880
R13: 1ffff920008bef1a R14: 00000000000000e9 R15: ffffc900045f7880
FS: 0000000000000000(0000) GS:ffff8881250cf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560fff6be950 CR3: 000000000eb38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
insn_get_opcode+0x67/0xe80 arch/x86/lib/insn.c:282
insn_get_modrm+0x63/0x740 arch/x86/lib/insn.c:369
insn_get_sib arch/x86/lib/insn.c:443 [inline]
insn_get_displacement+0x151/0x9a0 arch/x86/lib/insn.c:484
insn_get_immediate+0x62/0x11f0 arch/x86/lib/insn.c:650
insn_get_length arch/x86/lib/insn.c:723 [inline]
insn_decode+0x30b/0x4e0 arch/x86/lib/insn.c:762
arch_jump_entry_size arch/x86/kernel/jump_label.c:24 [inline]
__jump_label_patch+0xea/0x490 arch/x86/kernel/jump_label.c:45
arch_jump_label_transform_queue+0x68/0x100 arch/x86/kernel/jump_label.c:137
__jump_label_update+0x17f/0x3b0 kernel/jump_label.c:513
static_key_disable_cpuslocked+0xd2/0x1c0 kernel/jump_label.c:240
static_key_disable+0x1a/0x20 kernel/jump_label.c:248
toggle_allocation_gate+0x1b1/0x250 mm/kfence/core.c:855
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
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