bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode ================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2fc3/0x33f0 net/ipv4/tcp_timer.c:480 Read of size 8 at addr ffff88809cd54338 by task systemd-udevd/4702 CPU: 1 PID: 4702 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: overlayfs: unrecognized mount option "@NUçØ•Þxino=auto" or missing value __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 tcp_retransmit_timer+0x2fc3/0x33f0 net/ipv4/tcp_timer.c:480 overlayfs: failed to resolve './file0': -2 tcp_write_timer_handler+0x5e6/0xa60 net/ipv4/tcp_timer.c:593 tcp_write_timer+0x103/0x1b0 net/ipv4/tcp_timer.c:613 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0033:0x55b3e43f3b3e Code: d6 e8 26 fd ff ff 48 85 c0 74 05 48 89 03 eb c2 bd f4 ff ff ff eb bb 0f 1f 44 00 00 48 85 ff 0f 84 17 01 00 00 53 0f b6 47 2f <89> c1 83 e1 03 80 f9 01 0f 84 d4 01 00 00 48 85 f6 0f 84 ab 01 00 RSP: 002b:00007ffcc9eb24d0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 000000000000004a RBX: 000055b3e57ec190 RCX: 0000000000000000 RDX: 00007ffcc9eb2508 RSI: 00007ffcc9eb2510 RDI: 000055b3e57ec190 RBP: 00007ffcc9eb2508 R08: 00007ffcc9fc7000 R09: 000002e357469e77 R10: 0010513c2c98d676 R11: 0000000000000202 R12: 0000000000000000 R13: 000055b3e57e9620 R14: 000055b3e57e9600 R15: 0000000000000001 Allocated by task 11335: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 kmem_cache_zalloc include/linux/slab.h:699 [inline] net_alloc net/core/net_namespace.c:386 [inline] copy_net_ns+0x106/0x340 net/core/net_namespace.c:426 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2542 __do_sys_unshare kernel/fork.c:2610 [inline] __se_sys_unshare kernel/fork.c:2608 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2608 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5337: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 net_free net/core/net_namespace.c:402 [inline] net_drop_ns+0x73/0x90 net/core/net_namespace.c:409 cleanup_net+0x64c/0x8b0 net/core/net_namespace.c:572 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff88809cd54100 which belongs to the cache net_namespace of size 8704 The buggy address is located 568 bytes inside of 8704-byte region [ffff88809cd54100, ffff88809cd56300) The buggy address belongs to the page: page:ffffea0002735500 count:1 mapcount:0 mapping:ffff88823b843e00 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880b5b46948 ffffea0002967408 ffff88823b843e00 raw: 0000000000000000 ffff88809cd54100 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809cd54200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809cd54280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809cd54300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809cd54380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809cd54400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================