------------[ cut here ]------------
WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x364/0x400, CPU#1: syz-executor.5/27659
Modules linked in:
CPU: 1 UID: 0 PID: 27659 Comm: syz-executor.5 Not tainted 6.18.0-rc3-next-20251031 #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:ffff88800f057570 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffffffff85df91f8 RCX: ffffffff815559d6
RDX: ffff88801ffb8000 RSI: ffffffff81555ba3 RDI: 0000000000000006
RBP: ffff88800f057670 R08: 0000000000000001 R09: ffffed1001e0aed0
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85d30790
R13: 00003fffffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 00005555854a7400(0000) GS:ffff8880e54ed000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa7a1b4ef0 CR3: 000000004fbca000 CR4: 0000000000350ef0
Call Trace:
prb_reserve_in_last+0x5c2/0x11f0
vprintk_store+0x663/0xa20
vprintk_emit+0x150/0x690
_printk+0xbe/0xf0
pr_cont_kernfs_path+0x5c/0xb0
pids_can_fork+0x40a/0x4d0
cgroup_can_fork+0x3f8/0x11d0
copy_process+0x4189/0x7410
kernel_clone+0xea/0x7f0
__do_sys_clone+0xce/0x120
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa7a0d0f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffe97f1b5b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007faa77603700 RCX: 00007faa7a0d0f41
RDX: 00007faa776039d0 RSI: 00007faa776032f0 RDI: 00000000003d0f00
RBP: 00007ffe97f1b7f0 R08: 00007faa77603700 R09: 00007faa77603700
R10: 00007faa776039d0 R11: 0000000000000206 R12: 00007ffe97f1b66e
R13: 00007ffe97f1b66f R14: 00007faa77603300 R15: 0000000000022000
irq event stamp: 2278
hardirqs last enabled at (2277): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (2278): [] _raw_spin_lock_irqsave+0x53/0x60
softirqs last enabled at (2266): [] fpu_clone+0x146/0x740
softirqs last disabled at (2264): [] fpu_clone+0xd2/0x740
---[ end trace 0000000000000000 ]---
/syz5
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 27953 Comm: syz-executor.4 Tainted: G W 6.18.0-rc3-next-20251031 #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
_copy_from_user+0x30/0xd0
kstrtouint_from_user+0xbd/0x180
proc_fail_nth_write+0x7b/0x220
vfs_write+0x2b7/0x1150
ksys_write+0x121/0x240
do_syscall_64+0xbf/0x390
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf6dbfc5ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48
RSP: 002b:00007fcf6b19e170 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf6dbfc5ff
RDX: 0000000000000001 RSI: 00007fcf6b19e1e0 RDI: 0000000000000003
RBP: 00007fcf6b19e1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffe1096c45f R14: 00007fcf6b19e300 R15: 0000000000022000
Bluetooth: hci7: unexpected cc 0x0c03 length: 249 > 1
Bluetooth: hci7: unexpected cc 0x1003 length: 249 > 9
Bluetooth: hci7: unexpected cc 0x1001 length: 249 > 9
Bluetooth: hci7: unexpected cc 0x0c23 length: 249 > 4
Bluetooth: hci7: unexpected cc 0x0c38 length: 249 > 2
Bluetooth: hci7: command tx timeout
Bluetooth: hci7: command tx timeout
Bluetooth: hci7: command tx timeout