syzbot
WARNING: kmalloc bug in input_mt_init_slots
Status:
fixed on 2018/11/12 21:25
Subsystems:
input
[Documentation on labels]
Reported-by: syzbot+87829a10073277282ad1@syzkaller.appspotmail.com
Fix commit:
61448479a9f2
mm: don't warn about large allocations for slab
First crash: 2864d, last: 2830d
Sample crash report:
WARNING: CPU: 0 PID: 2880 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 mm/slab_common.c:1031
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 2880 Comm: syz-executor472 Not tainted 4.19.0-rc4+ #249
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:kmalloc_slab+0x56/0x70 mm/slab_common.c:1031
kobject: 'input19939' (00000000d34ab3dc): kobject_cleanup, parent (null)
Code: c5 60 2b 17 89 5d c3 48 85 ff b8 10 00 00 00 74 f4 83 ef 01 c1 ef 03 0f b6 87 80 2a 17 89 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 a0 2a 17 89 5d c3 66 90 66 2e 0f 1f 84 00
kobject: 'input19939' (00000000d34ab3dc): calling ktype release
RSP: 0018:ffff8801cb35f978 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000fffffffd RCX: ffffffff8534cee7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000003fffffff60
RBP: ffff8801cb35f978 R08: ffff8801d37486c0 R09: ffffed003a6446d9
R10: ffff8801cb35fa48 R11: ffff8801d32236cf R12: 0000000000000000
R13: 0000000000000000 R14: ffff8801d3130940 R15: 00000000006080c0
__do_kmalloc mm/slab.c:3713 [inline]
__kmalloc+0x25/0x760 mm/slab.c:3727
kobject: 'input19939': free name
kmalloc include/linux/slab.h:518 [inline]
kzalloc include/linux/slab.h:707 [inline]
input_mt_init_slots+0xe5/0x4a0 drivers/input/input-mt.c:52
uinput_create_device drivers/input/misc/uinput.c:335 [inline]
uinput_ioctl_handler.isra.10+0x2049/0x2540 drivers/input/misc/uinput.c:876
uinput_ioctl+0x4c/0x60 drivers/input/misc/uinput.c:1047
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
__do_sys_ioctl fs/ioctl.c:709 [inline]
__se_sys_ioctl fs/ioctl.c:707 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x449f29
Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f40e8ad7ce8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dec28 RCX: 0000000000449f29
RDX: 0000000000449f29 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00000000006dec20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000006dec2c
R13: 00007fff7392efcf R14: 00007f40e8ad89c0 R15: 00000000006ded2c
Kernel Offset: disabled
Rebooting in 86400 seconds..
Struck through repros no longer work on HEAD.