==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
BUG: KASAN: slab-use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline]
BUG: KASAN: slab-use-after-free in gfs2_qd_dealloc+0x81/0xe0 fs/gfs2/quota.c:112
Write of size 4 at addr ffff88807ee54b68 by task udevd/5194
CPU: 1 UID: 0 PID: 5194 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline]
gfs2_qd_dealloc+0x81/0xe0 fs/gfs2/quota.c:112
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x7c0 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727
irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0a 92 1d f6 48 89 df e8 52 06 1e f6 e8 dd 4d 48 f6 fb bf 01 00 00 00 d2 04 10 f6 65 8b 05 db b7 70 07 85 c0 74 07 5b e9 81 48 00 00
RSP: 0018:ffffc90003077bf0 EFLAGS: 00000202
RAX: 00000000000fc907 RBX: ffff88807dc64d40 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dce9260 RDI: 0000000000000001
RBP: ffffc90003077df0 R08: ffffffff8fefddb7 R09: 1ffffffff1fdfbb6
R10: dffffc0000000000 R11: fffffbfff1fdfbb7 R12: dffffc0000000000
R13: ffff88807ea18018 R14: ffffc90003077d38 R15: ffff88807dc64cd0
spin_unlock_irq include/linux/spinlock.h:404 [inline]
ep_poll fs/eventpoll.c:2024 [inline]
do_epoll_wait+0xcac/0xf60 fs/eventpoll.c:2461
__do_sys_epoll_wait fs/eventpoll.c:2469 [inline]
__se_sys_epoll_wait fs/eventpoll.c:2464 [inline]
__x64_sys_epoll_wait+0x1d7/0x230 fs/eventpoll.c:2464
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faea38a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff89823880 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 00007faea3fde880 RCX: 00007faea38a7407
RDX: 0000000000000008 RSI: 00007fff898239e0 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000
R13: 0000556922462100 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 6199:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5244
kmalloc_noprof include/linux/slab.h:962 [inline]
kzalloc_noprof include/linux/slab.h:1204 [inline]
init_sbd fs/gfs2/ops_fstype.c:79 [inline]
gfs2_fill_super+0x128/0x21d0 fs/gfs2/ops_fstype.c:1121
get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3760 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3836
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4325
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6199:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2621 [inline]
slab_free mm/slub.c:6026 [inline]
kfree+0x1c1/0x610 mm/slub.c:6339
free_sbd fs/gfs2/ops_fstype.c:72 [inline]
gfs2_fill_super+0x150e/0x21d0 fs/gfs2/ops_fstype.c:1316
get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3760 [inline]
do_new_mount+0x341/0xd30 fs/namespace.c:3836
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4325
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88807ee54000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2920 bytes inside of
freed 8192-byte region [ffff88807ee54000, ffff88807ee56000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ee50
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b027280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b027280 dead000000000100 dead000000000122
head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0001fb9401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5849, tgid 5849 (sh), ts 320913974016, free_ts 320680860609
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1883
prep_new_page mm/page_alloc.c:1891 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3956
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5244
alloc_slab_page mm/slub.c:3189 [inline]
allocate_slab+0x7b/0x660 mm/slub.c:3362
new_slab mm/slub.c:3420 [inline]
refill_objects+0x33a/0x3d0 mm/slub.c:7028
refill_sheaf mm/slub.c:2738 [inline]
__pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4483
alloc_from_pcs mm/slub.c:4586 [inline]
slab_alloc_node mm/slub.c:4720 [inline]
__kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5239
kmalloc_noprof include/linux/slab.h:962 [inline]
kzalloc_noprof include/linux/slab.h:1204 [inline]
tomoyo_print_bprm security/tomoyo/audit.c:26 [inline]
tomoyo_init_log+0x112e/0x1fb0 security/tomoyo/audit.c:264
tomoyo_supervisor+0x353/0x1570 security/tomoyo/common.c:2232
tomoyo_audit_env_log security/tomoyo/environ.c:37 [inline]
tomoyo_env_perm+0x151/0x1f0 security/tomoyo/environ.c:64
tomoyo_environ security/tomoyo/domain.c:673 [inline]
tomoyo_find_next_domain+0x15cb/0x1aa0 security/tomoyo/domain.c:889
tomoyo_bprm_check_security+0x11b/0x180 security/tomoyo/tomoyo.c:102
security_bprm_check+0x85/0x240 security/security.c:794
search_binary_handler fs/exec.c:1654 [inline]
exec_binprm fs/exec.c:1696 [inline]
bprm_execve+0x896/0x1410 fs/exec.c:1748
do_execveat_common+0x50d/0x690 fs/exec.c:1846
__do_sys_execve fs/exec.c:1930 [inline]
__se_sys_execve fs/exec.c:1924 [inline]
__x64_sys_execve+0x97/0xc0 fs/exec.c:1924
page last free pid 5847 tgid 5847 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1432 [inline]
__free_frozen_pages+0xbb9/0xd10 mm/page_alloc.c:2972
__slab_free+0x263/0x2b0 mm/slub.c:5437
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4406 [inline]
slab_alloc_node mm/slub.c:4735 [inline]
__kmalloc_cache_noprof+0x2ba/0x660 mm/slub.c:5239
kmalloc_noprof include/linux/slab.h:962 [inline]
kzalloc_noprof include/linux/slab.h:1204 [inline]
seccomp_prepare_filter kernel/seccomp.c:696 [inline]
seccomp_prepare_user_filter kernel/seccomp.c:738 [inline]
seccomp_set_mode_filter kernel/seccomp.c:1990 [inline]
do_seccomp+0x75d/0xdd0 kernel/seccomp.c:2110
__do_sys_prctl kernel/sys.c:2625 [inline]
__se_sys_prctl+0x38a/0x1a60 kernel/sys.c:2533
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88807ee54a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807ee54a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807ee54b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807ee54b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807ee54c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: f3 0f 1e fa endbr64
5: 53 push %rbx
6: 48 89 fb mov %rdi,%rbx
9: 48 83 c7 18 add $0x18,%rdi
d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
12: e8 0a 92 1d f6 call 0xf61d9221
17: 48 89 df mov %rbx,%rdi
1a: e8 52 06 1e f6 call 0xf61e0671
1f: e8 dd 4d 48 f6 call 0xf6484e01
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 d2 04 10 f6 call 0xf6100501 <-- trapping instruction
2f: 65 8b 05 db b7 70 07 mov %gs:0x770b7db(%rip),%eax # 0x770b811
36: 85 c0 test %eax,%eax
38: 74 07 je 0x41
3a: 5b pop %rbx
3b: e9 81 48 00 00 jmp 0x48c1