INFO: task syz.2.16:480 blocked for more than 122 seconds.
Not tainted 6.12.38-syzkaller-08792-g47365056686e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.16 state:D stack:0 pid:480 tgid:478 ppid:468 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_read_slowpath+0x6d1/0x1460 kernel/locking/rwsem.c:1136
__down_read_common kernel/locking/rwsem.c:1317 [inline]
__down_read kernel/locking/rwsem.c:1330 [inline]
down_read+0x8f/0xe0 kernel/locking/rwsem.c:1607
inode_lock_shared include/linux/fs.h:825 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1748
walk_component+0x302/0x440 fs/namei.c:2053
lookup_last fs/namei.c:2556 [inline]
path_lookupat+0x180/0x4a0 fs/namei.c:2580
filename_lookup+0x1f5/0x520 fs/namei.c:2609
user_path_at+0x42/0x60 fs/namei.c:3016
do_mount fs/namespace.c:3863 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x288/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f413258e929
RSP: 002b:00007f413336d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f41327b6080 RCX: 00007f413258e929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f4132610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f41327b6080 R15: 00007ffe0a1174c8
INFO: task syz.3.17:496 blocked for more than 123 seconds.
Not tainted 6.12.38-syzkaller-08792-g47365056686e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.17 state:D stack:0 pid:496 tgid:492 ppid:482 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_read_slowpath+0x6d1/0x1460 kernel/locking/rwsem.c:1136
__down_read_common kernel/locking/rwsem.c:1317 [inline]
__down_read kernel/locking/rwsem.c:1330 [inline]
down_read+0x8f/0xe0 kernel/locking/rwsem.c:1607
inode_lock_shared include/linux/fs.h:825 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1748
walk_component+0x302/0x440 fs/namei.c:2053
lookup_last fs/namei.c:2556 [inline]
path_lookupat+0x180/0x4a0 fs/namei.c:2580
filename_lookup+0x1f5/0x520 fs/namei.c:2609
user_path_at+0x42/0x60 fs/namei.c:3016
do_mount fs/namespace.c:3863 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x288/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd2daf8e929
RSP: 002b:00007fd2dbe39038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd2db1b6080 RCX: 00007fd2daf8e929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007fd2db010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fd2db1b6080 R15: 00007ffd3321cf48
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-08792-g47365056686e #0 795e349415ae29da9b87256c4727c33f563c680f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.38-syzkaller-08792-g47365056686e #0 795e349415ae29da9b87256c4727c33f563c680f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_unlock kernel/smp.c:368 [inline]
RIP: 0010:__flush_smp_call_function_queue+0x65d/0xc70 kernel/smp.c:570
Code: 00 00 00 00 fc ff df 41 0f b6 04 06 84 c0 0f 85 b4 00 00 00 45 8b 27 44 89 e6 83 e6 01 31 ff e8 19 4d 0a 00 41 83 e4 01 74 77 ce 48 0a 00 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 06 84 c0
RSP: 0018:ffffc90000007f68 EFLAGS: 00000002
RAX: ffffffff817b80d7 RBX: 0000000000000000 RCX: 0000000000010000
RDX: ffffffff87215540 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000007fb8 R08: ffffffff87215540 R09: 0000000000000002
R10: 0000000000000020 R11: 0000000000010000 R12: 0000000000000001
R13: ffff8881f6e4f800 R14: 1ffff1103edc9f05 R15: ffff8881f6e4f828
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2372894d58 CR3: 000000012dcc0000 CR4: 00000000003526b0
Call Trace:
generic_smp_call_function_single_interrupt+0x17/0x20 kernel/smp.c:457
__sysvec_call_function_single+0x28/0x230 arch/x86/kernel/smp.c:271
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0x7a/0x90 arch/x86/kernel/smp.c:266
asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:709
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 92 5c bf f2 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 c1 40 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff87207da0 EFLAGS: 000002c6
RAX: ffff8881f6e00000 RBX: ffffffff87215540 RCX: ffffffff8586909e
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000000498d4
RBP: ffffffff87207da0 R08: ffff8881f6e39733 R09: 1ffff1103edc72e6
R10: dffffc0000000000 R11: ffffed103edc72e7 R12: 1ffffffff0e42aa8
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff87ca8b28
arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
default_idle+0x17/0x30 arch/x86/kernel/process.c:754
arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
default_idle_call+0x3f/0x80 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x1a0/0x470 kernel/sched/idle.c:326
cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:424
rest_init+0x10b/0x130 init/main.c:748
start_kernel+0x46a/0x4bb init/main.c:1135
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
common_startup_64+0x13b/0x157