INFO: task syz.7.380:7654 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.380 state:D stack:28800 pid:7654 tgid:7652 ppid:6486 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7119
rwsem_down_write_slowpath+0x883/0x1080 kernel/locking/rwsem.c:1215
__down_write_common kernel/locking/rwsem.c:1347 [inline]
__down_write kernel/locking/rwsem.c:1356 [inline]
down_write+0x1bc/0x200 kernel/locking/rwsem.c:1626
inode_lock include/linux/fs.h:1028 [inline]
vfs_unlink+0xed/0x6c0 fs/namei.c:5478
filename_unlinkat+0x3cd/0x610 fs/namei.c:5562
__do_sys_unlinkat fs/namei.c:5591 [inline]
__se_sys_unlinkat+0x83/0x1a0 fs/namei.c:5583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5915b9c799
RSP: 002b:00007f59169b4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007f5915e16090 RCX: 00007f5915b9c799
RDX: 0000000000000000 RSI: 00002000000011c0 RDI: 0000000000000003
RBP: 00007f5915c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5915e16128 R14: 00007f5915e16090 R15: 00007ffd5497abd8
INFO: task syz.7.380:7656 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.380 state:D stack:28800 pid:7656 tgid:7652 ppid:6486 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7119
rwsem_down_write_slowpath+0x883/0x1080 kernel/locking/rwsem.c:1215
__down_write_common kernel/locking/rwsem.c:1347 [inline]
__down_write kernel/locking/rwsem.c:1356 [inline]
down_write+0x1bc/0x200 kernel/locking/rwsem.c:1626
inode_lock include/linux/fs.h:1028 [inline]
do_lock_mount+0x2b3/0x960 fs/namespace.c:2763
do_new_mount_fc fs/namespace.c:3782 [inline]
do_new_mount+0x483/0xd30 fs/namespace.c:3840
do_mount fs/namespace.c:4173 [inline]
__do_sys_mount fs/namespace.c:4372 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4349
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5915b9c799
RSP: 002b:00007f5916993028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5915e16180 RCX: 00007f5915b9c799
RDX: 0000200000000300 RSI: 00002000000001c0 RDI: 0000000000000000
RBP: 00007f5915c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5915e16218 R14: 00007f5915e16180 R15: 00007ffd5497abd8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e75d6a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75d6a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5598:
#0: ffff888037e9f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
3 locks held by syz.7.380/7654:
#0: ffff888036a6a410 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff88803228a120 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1073 [inline]
#1: ffff88803228a120 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2908 [inline]
#1: ffff88803228a120 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2932 [inline]
#1: ffff88803228a120 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: filename_unlinkat+0x2a7/0x610 fs/namei.c:5543
#2: ffff88807c89cc00 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#2: ffff88807c89cc00 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: vfs_unlink+0xed/0x6c0 fs/namei.c:5478
1 lock held by syz.7.380/7656:
#0: ffff88807c89cc00 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff88807c89cc00 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: do_lock_mount+0x2b3/0x960 fs/namespace.c:2763
1 lock held by syz-executor/8933:
#0: ffffffff8e7638e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#0: ffffffff8e7638e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by syz.4.814/9427:
4 locks held by dhcpcd-run-hook/9557:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0x1002/0x1060 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
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: 9472 Comm: syz.2.747 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:148 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x253/0x2c0 mm/kasan/generic.c:200
Code: ef 30 bb 07 00 00 00 45 84 ff 75 7d 4d 01 f3 49 01 db 4d 89 dc 4d 85 db 74 84 4d 01 d1 4d 39 cc 75 11 41 83 e0 07 45 0f be 09 <45> 39 c8 0f 8c 6b ff ff ff 0f b6 d2 e8 3c f0 ff ff 34 01 e9 5c ff
RSP: 0018:ffffc9000456f508 EFLAGS: 00000006
RAX: 00000000ffffff01 RBX: ffffffffffffffff RCX: ffffffff81a3447b
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc9000456f580
RBP: ffffc9000456f600 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520008adeb0 R12: fffff520008adeb0
R13: ffff88807a89ab88 R14: fffff520008adeb1 R15: 1ffff920008adeb0
FS: 00007ff915afc6c0(0000) GS:ffff888125436000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000e0e030 CR3: 000000003504a000 CR4: 00000000003526f0
Call Trace:
instrument_read_write include/linux/instrumented.h:55 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1301 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock+0x12b/0x2f0 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock_irqsave+0x4c/0x60 kernel/locking/spinlock.c:162
__skb_try_recv_datagram+0x14a/0x4d0 net/core/datagram.c:264
__unix_dgram_recvmsg+0x2e3/0xd60 net/unix/af_unix.c:2573
sock_recvmsg_nosec+0x10c/0x140 net/socket.c:1151
____sys_recvmsg+0x245/0x510 net/socket.c:-1
___sys_recvmsg+0x215/0x590 net/socket.c:2930
do_recvmmsg+0x334/0x800 net/socket.c:3025
__sys_recvmmsg net/socket.c:3099 [inline]
__do_sys_recvmmsg net/socket.c:3122 [inline]
__se_sys_recvmmsg net/socket.c:3115 [inline]
__x64_sys_recvmmsg+0x198/0x250 net/socket.c:3115
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff914b9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff915afc028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007ff914e16090 RCX: 00007ff914b9c799
RDX: 00000000080002c1 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007ff914c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff914e16128 R14: 00007ff914e16090 R15: 00007ffc24e01288