RBP: 00007f331a6941d0 R08: 0000000000000000 R09: 0000000000000000
R13: 00007fff96137acf R14: 00007f331a694300 R15: 0000000000022000
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#0: syz-executor.4/7585
Modules linked in:
CPU: 0 UID: 0 PID: 7585 Comm: syz-executor.4 Not tainted 6.18.0-rc3-next-20251028 #1 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:get_data+0x364/0x400
Code: e8 83 e0 07 83 c0 03 38 d0 0f 8c be fe ff ff 84 d2 0f 84 b6 fe ff ff 48 89 ef e8 47 95 5b 00 e9 a9 fe ff ff e8 3d bb 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 2c bb 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88806ce08720 EFLAGS: 00010046
RAX: 0000000000010000 RBX: ffff88806ce08838 RCX: ffffffff81555756
RDX: ffff8880177a3700 RSI: ffffffff81555923 RDI: 0000000000000006
RBP: ffff88806ce08800 R08: 0000000000001109 R09: 000000ba4f6ab27a
R10: 0000000000000000 R11: 00001da182000041 R12: ffffffff85d30650
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00007f331a694700(0000) GS:ffff8880e53f4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020005000 CR3: 0000000017078000 CR4: 0000000000350ef0
Call Trace:
_prb_read_valid+0x2f3/0x830
prb_read_valid+0x78/0xa0
printk_get_next_message+0x10b/0x570
console_flush_one_record+0x64f/0xb20
__console_flush_and_unlock+0xb1/0x1d0
wake_up_klogd_work_func+0x17c/0x1e0
irq_work_single+0x128/0x260
irq_work_run_list+0x91/0xc0
update_process_times+0x12f/0x210
tick_nohz_handler+0x414/0x6d0
__hrtimer_run_queues+0x60f/0xac0
hrtimer_interrupt+0x369/0x830
__sysvec_apic_timer_interrupt+0xbb/0x330
sysvec_apic_timer_interrupt+0x6b/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:dump_stack_lvl+0x115/0x120
Code: fc ff ff 4c 89 e2 31 f6 31 ff e8 86 87 72 fc e8 91 80 9c fc 48 89 ee 31 ff e8 c7 51 bc fc e8 62 56 bc fc e8 0d b3 c4 fc fb 5b <5d> 41 5c e9 53 56 bc fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff88804a74f1e0 EFLAGS: 00000206
RAX: 00000000000008b7 RBX: ffffffff8609f300 RCX: ffffffff817c7026
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84b7be03
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86646857 R11: 0000000000000001 R12: ffffffff855192e0
R13: ffffffff8609f310 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
_copy_from_user+0x30/0xd0
csum_and_copy_from_iter_full+0x1fb/0x1f30
ip_generic_getfrag+0x181/0x270
__ip_append_data+0x17ab/0x40d0
ip_make_skb+0x22b/0x2a0
udp_sendmsg+0x1647/0x22c0
inet_sendmsg+0x109/0x150
____sys_sendmsg+0x947/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmmsg+0x1f5/0x420
__x64_sys_sendmmsg+0x9d/0x110
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f331d11eb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f331a694188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f331d231f60 RCX: 00007f331d11eb19
RDX: 0000000000000001 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 00007f331a6941d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff96137acf R14: 00007f331a694300 R15: 0000000000022000
irq event stamp: 2232
hardirqs last enabled at (2231): [] dump_stack_lvl+0x113/0x120
hardirqs last disabled at (2232): [] sysvec_apic_timer_interrupt+0xf/0x80
softirqs last enabled at (2226): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (2213): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
EXT4-fs (loop6): unmounting filesystem 00000000-0000-0000-0000-000000000000.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 7626 Comm: syz-executor.4 Tainted: G W 6.18.0-rc3-next-20251028 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xfa/0x120
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
kmem_cache_alloc_node_noprof+0x87/0x6b0
__alloc_skb+0x2ab/0x370
__ip_append_data+0x319b/0x40d0
ip_make_skb+0x22b/0x2a0
udp_sendmsg+0x1647/0x22c0
inet_sendmsg+0x109/0x150
____sys_sendmsg+0x947/0xc20
___sys_sendmsg+0x10f/0x1b0
__sys_sendmmsg+0x1f5/0x420
__x64_sys_sendmmsg+0x9d/0x110
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f331d11eb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f331a694188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f331d231f60 RCX: 00007f331d11eb19
RDX: 0000000000000001 RSI: 0000000020000640 RDI: 0000000000000003
RBP: 00007f331a6941d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff96137acf R14: 00007f331a694300 R15: 0000000000022000
loop6: detected capacity change from 0 to 1024
EXT4-fs (loop6): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
EXT4-fs (loop6): unmounting filesystem 00000000-0000-0000-0000-000000000000.
----------------
Code disassembly (best guess), 2 bytes skipped:
0: ff 4c 89 e2 decl -0x1e(%rcx,%rcx,4)
4: 31 f6 xor %esi,%esi
6: 31 ff xor %edi,%edi
8: e8 86 87 72 fc callq 0xfc728793
d: e8 91 80 9c fc callq 0xfc9c80a3
12: 48 89 ee mov %rbp,%rsi
15: 31 ff xor %edi,%edi
17: e8 c7 51 bc fc callq 0xfcbc51e3
1c: e8 62 56 bc fc callq 0xfcbc5683
21: e8 0d b3 c4 fc callq 0xfcc4b333
26: fb sti
27: 5b pop %rbx
* 28: 5d pop %rbp <-- trapping instruction
29: 41 5c pop %r12
2b: e9 53 56 bc fc jmpq 0xfcbc5683
30: 0f 1f 00 nopl (%rax)
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop