RBP: 00007f1ed3301040 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000200001c0
R13: 0000000020000200 R14: 00007f1ed3301000 R15: 00000000200003c0
------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#0: syz-executor.0/11744
Modules linked in:
CPU: 0 UID: 0 PID: 11744 Comm: syz-executor.0 Not tainted 6.18.0-rc3-next-20251030 #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 17 b8 5b 00 e9 a9 fe ff ff e8 4d bb 1e 00 90 <0f> 0b 90 45 31 e4 e9 3b ff ff ff e8 3c bb 1e 00 90 0f 0b 90 45 31
RSP: 0018:ffff88806ce08720 EFLAGS: 00010046
RAX: 0000000000010000 RBX: ffff88806ce08838 RCX: ffffffff81555746
RDX: ffff8880170c9b80 RSI: ffffffff81555913 RDI: 0000000000000006
RBP: ffff88806ce08800 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85d30790
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00007f1ed3301700(0000) GS:ffff8880e53f0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007facd290b3a4 CR3: 000000001e661000 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 c7 71 fc e8 81 c0 9b fc 48 89 ee 31 ff e8 c7 91 bb fc e8 62 96 bb fc e8 0d 01 c4 fc fb 5b <5d> 41 5c e9 53 96 bb fc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffff88801f207530 EFLAGS: 00000202
RAX: 000000000000020d RBX: ffffffff85f039e0 RCX: 0000000000000040
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84b87e03
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86647757 R11: 0000000000000001 R12: ffffffff85519d40
R13: ffffffff85f039f0 R14: 0000000000000000 R15: 0000000000000000
should_fail_ex+0x4d7/0x5e0
should_failslab+0xc2/0x120
__kmalloc_noprof+0xcd/0x680
ext4_find_extent+0x7f5/0xa00
ext4_ext_map_blocks+0x1cc/0x5f70
ext4_map_blocks+0x624/0x14a0
ext4_getblk+0x682/0x8e0
ext4_bread+0x2e/0x1a0
ext4_append+0x224/0x530
ext4_init_new_dir+0x13c/0x240
ext4_mkdir+0x3c5/0xb30
vfs_mkdir+0x59a/0x8d0
do_mkdirat+0x19f/0x3d0
__x64_sys_mkdir+0xf3/0x140
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ed5d8ac27
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 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:00007f1ed3300fa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 00007f1ed5d8ac27
RDX: 0000000000000004 RSI: 00000000000001ff RDI: 0000000020000200
RBP: 00007f1ed3301040 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000200001c0
R13: 0000000020000200 R14: 00007f1ed3301000 R15: 00000000200003c0
irq event stamp: 526
hardirqs last enabled at (525): [] dump_stack_lvl+0x113/0x120
hardirqs last disabled at (526): [] sysvec_apic_timer_interrupt+0xf/0x80
softirqs last enabled at (520): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (485): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
loop7: detected capacity change from 0 to 264192
iso9660: Unknown parameter 'pcr'
loop0: detected capacity change from 0 to 1
FAT-fs (loop0): invalid media value (0x00)
FAT-fs (loop0): Can't find a valid FAT filesystem
loop1: detected capacity change from 0 to 264192
loop0: detected capacity change from 0 to 1
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 11808 Comm: syz-executor.0 Tainted: G W 6.18.0-rc3-next-20251030 #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_noprof+0x80/0x690
ext4_mb_new_blocks+0x64e/0x45b0
ext4_ext_map_blocks+0x1c4b/0x5f70
ext4_map_blocks+0x624/0x14a0
ext4_getblk+0x682/0x8e0
ext4_bread+0x2e/0x1a0
ext4_append+0x224/0x530
ext4_init_new_dir+0x13c/0x240
ext4_mkdir+0x3c5/0xb30
vfs_mkdir+0x59a/0x8d0
do_mkdirat+0x19f/0x3d0
__x64_sys_mkdir+0xf3/0x140
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ed5d8ac27
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 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:00007f1ed3300fa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 00007f1ed5d8ac27
RDX: 0000000000000004 RSI: 00000000000001ff RDI: 0000000020000200
RBP: 00007f1ed3301040 R08: 0000000000000000 R09: ffffffffffffffff
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000200001c0
R13: 0000000020000200 R14: 00007f1ed3301000 R15: 00000000200003c0
----------------
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 c7 71 fc callq 0xfc71c793
d: e8 81 c0 9b fc callq 0xfc9bc093
12: 48 89 ee mov %rbp,%rsi
15: 31 ff xor %edi,%edi
17: e8 c7 91 bb fc callq 0xfcbb91e3
1c: e8 62 96 bb fc callq 0xfcbb9683
21: e8 0d 01 c4 fc callq 0xfcc40133
26: fb sti
27: 5b pop %rbx
* 28: 5d pop %rbp <-- trapping instruction
29: 41 5c pop %r12
2b: e9 53 96 bb fc jmpq 0xfcbb9683
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