------------[ cut here ]------------
WARNING: fs/namespace.c:1434 at mntput_no_expire+0x78e/0xbe0, CPU#0: syz-executor.5/284
Modules linked in:
CPU: 0 UID: 0 PID: 284 Comm: syz-executor.5 Tainted: G W 6.17.0-rc4-next-20250901 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:mntput_no_expire+0x78e/0xbe0
Code: 05 d6 30 81 04 01 e8 71 df 91 ff e9 41 fc ff ff e8 27 47 b4 ff 31 ff 44 89 ee e8 4d 42 b4 ff 45 85 ed 79 09 e8 13 47 b4 ff 90 <0f> 0b 90 e8 0a 47 b4 ff e8 b5 2d fc 02 31 ff 89 c5 89 c6 e8 2a 42
RSP: 0018:ffff888009a77ce0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff1100134efa1 RCX: ffffffff81bfaf93
RDX: ffff88800f6e5280 RSI: ffffffff81bfaf9d RDI: 0000000000000005
RBP: ffff888016828fc0 R08: 0000000000000001 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000001 R12: ffff888009a77d48
R13: 00000000ffffffff R14: ffff888016828fc0 R15: ffff8880168290a8
FS: 000055558a22b400(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff80944c38 CR3: 000000003e814000 CR4: 0000000000350ef0
Call Trace:
path_umount+0x6e0/0x1100
__x64_sys_umount+0x15c/0x190
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd5a698f87
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff80945378 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007efd5a698f87
RDX: 00007fff80945449 RSI: 000000000000000a RDI: 00007fff80945440
RBP: 00007fff80945440 R08: 00000000ffffffff R09: 00007fff80945210
R10: 000055558a22cc7b R11: 0000000000000246 R12: 00007efd5a6f1105
R13: 00007fff80946500 R14: 000055558a22cc20 R15: 00007fff80946540
irq event stamp: 181127
hardirqs last enabled at (181137): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (181144): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (180798): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (180789): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
Oops: general protection fault, probably for non-canonical address 0xdffffc001fffffff: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x00000000fffffff8-0x00000000ffffffff]
CPU: 1 UID: 0 PID: 64 Comm: kworker/1:2 Tainted: G W 6.17.0-rc4-next-20250901 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Workqueue: events kmemleak_do_cleanup
RIP: 0010:dst_dev_put+0x21/0x250
Code: 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 54 55 53 48 89 fb e8 f0 9a a8 fd 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 b5 01 00 00 48 8d 7b 3a 48 8b 2b 48 b8 00 00 00
RSP: 0018:ffff88806cf08d78 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 00000000ffffffff RCX: ffffffff841076c7
RDX: 000000001fffffff RSI: ffffffff83cb5bc0 RDI: 00000000ffffffff
RBP: dffffc0000000000 R08: 0000000000000000 R09: fffffbfff0c8768a
R10: 0000000000000000 R11: 0000000000000001 R12: fffffbfff0b0a4ac
R13: 0000607f1a631490 R14: 0000607f1a631490 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880e56d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020030008 CR3: 0000000040e19000 CR4: 0000000000350ef0
Call Trace:
rt_fibinfo_free_cpus.part.0+0xdb/0x1a0
fib_nh_common_release+0xa8/0x2c0
free_fib_info_rcu+0x1cd/0x430
rcu_core+0x7c8/0x1800
handle_softirqs+0x1b1/0x770
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x122/0x2f0
Code: 00 00 65 8b 05 b7 e2 32 06 85 c0 0f 85 b6 00 00 00 65 48 8b 05 f7 a2 32 06 8b 90 54 0a 00 00 85 d2 0f 85 a0 00 00 00 9c 41 5f 65 ff 05 8e e2 32 06 6a 00 41 81 e7 00 02 00 00 41 89 d8 44 89
RSP: 0018:ffff88800c52f778 EFLAGS: 00000246
RAX: ffff88800eb79b80 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8135841d RDI: fffffbfff0b838ec
RBP: ffffffff85c1c760 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88800c52f8b0 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000246
unwind_next_frame+0xcd/0x2540
__unwind_start+0x517/0x7c0
arch_stack_walk+0x62/0xf0
stack_trace_save+0x8e/0xc0
kasan_save_stack+0x24/0x50
kasan_record_aux_stack+0x89/0xa0
__call_rcu_common.constprop.0+0x70/0x960
__kmemleak_do_cleanup+0x4a/0x90
process_one_work+0x8e1/0x19c0
worker_thread+0x67e/0xe90
kthread+0x3c8/0x740
ret_from_fork+0x34b/0x430
ret_from_fork_asm+0x1a/0x30
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dst_dev_put+0x21/0x250
Code: 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 54 55 53 48 89 fb e8 f0 9a a8 fd 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 b5 01 00 00 48 8d 7b 3a 48 8b 2b 48 b8 00 00 00
RSP: 0018:ffff88806cf08d78 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 00000000ffffffff RCX: ffffffff841076c7
RDX: 000000001fffffff RSI: ffffffff83cb5bc0 RDI: 00000000ffffffff
EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
RBP: dffffc0000000000 R08: 0000000000000000 R09: fffffbfff0c8768a
R10: 0000000000000000 R11: 0000000000000001 R12: fffffbfff0b0a4ac
R13: 0000607f1a631490 R14: 0000607f1a631490 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880e56d8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020030008 CR3: 0000000040e19000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: f3 0f 1e fa endbr64
d: 41 54 push %r12
f: 55 push %rbp
10: 53 push %rbx
11: 48 89 fb mov %rdi,%rbx
14: e8 f0 9a a8 fd callq 0xfda89b09
19: 48 89 da mov %rbx,%rdx
1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
23: fc ff df
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 b5 01 00 00 jne 0x1e9
34: 48 8d 7b 3a lea 0x3a(%rbx),%rdi
38: 48 8b 2b mov (%rbx),%rbp
3b: 48 rex.W
3c: b8 .byte 0xb8
3d: 00 00 add %al,(%rax)