bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state ================================================================== BUG: KASAN: use-after-free in tasklet_action+0x29f/0x340 kernel/softirq.c:506 Read of size 8 at addr ffff8880aa6f4550 by task systemd-udevd/10660 CPU: 0 PID: 10660 Comm: systemd-udevd Not tainted 4.14.288-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 tasklet_action+0x29f/0x340 kernel/softirq.c:506 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:lock_is_held_type+0x17f/0x210 kernel/locking/lockdep.c:4041 RSP: 0018:ffff8880574ff618 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1341 RBX: 0000000000000286 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: 0000000000000286 RBP: ffff8880b4c2a300 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880ba434400 R14: ffff8880574f8000 R15: ffff8880b4c2a300 lock_is_held include/linux/lockdep.h:437 [inline] schedule_debug kernel/sched/core.c:3209 [inline] __schedule+0xf1b/0x1de0 kernel/sched/core.c:3311 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3614 retint_kernel+0x1b/0x2d RIP: 0010:unwind_get_return_address arch/x86/kernel/unwind_orc.c:252 [inline] RIP: 0010:unwind_get_return_address+0x6a/0x90 arch/x86/kernel/unwind_orc.c:247 RSP: 0018:ffff8880574ff7d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8880574ff800 RCX: 0000000000000000 RDX: 1ffff1100ae9ff09 RSI: ffff8880574ff6f0 RDI: ffffffff818a2244 RBP: ffff8880574ff848 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880574ffbb0 R11: 0000000000000001 R12: ffff8880574ff888 R13: 0000000000000000 R14: ffff88813fe744c0 R15: 0000000000000048 __save_stack_trace+0xa0/0x160 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] aa_alloc_file_ctx security/apparmor/include/file.h:60 [inline] apparmor_file_alloc_security+0x129/0x800 security/apparmor/lsm.c:431 security_file_alloc+0x66/0xa0 security/security.c:874 get_empty_filp+0x16b/0x3f0 fs/file_table.c:129 path_openat+0x84/0x2970 fs/namei.c:3545 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fc1968e86f0 RSP: 002b:00007fffd857d748 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000555e93470bd0 RCX: 00007fc1968e86f0 RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007fffd857d8f0 RBP: 0000000000000008 R08: 0000000000000008 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000246 R12: 0000555e92a1068a R13: 0000000000000001 R14: 0000555e9346f2e0 R15: 00007fffd857d970 Allocated by task 10652: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] bcm_tx_setup net/can/bcm.c:960 [inline] bcm_sendmsg+0x20bb/0x3ae0 net/can/bcm.c:1396 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 10655: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 bcm_release+0x255/0x900 net/can/bcm.c:1571 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 get_signal+0x18a3/0x1ca0 kernel/signal.c:2223 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880aa6f4480 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 208 bytes inside of 1024-byte region [ffff8880aa6f4480, ffff8880aa6f4880) The buggy address belongs to the page: page:ffffea0002a9bd00 count:1 mapcount:0 mapping:ffff8880aa6f4000 index:0xffff8880aa6f4d80 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880aa6f4000 ffff8880aa6f4d80 0000000100000002 raw: ffffea00028167a0 ffffea0002d4d820 ffff88813fe74ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880aa6f4400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880aa6f4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880aa6f4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880aa6f4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880aa6f4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================