UDF-fs: warning (device loop5): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 2048 failed UDF-fs: warning (device loop5): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 4096 failed ================================================================== BUG: KASAN: use-after-free in tcp_orphan_retries net/ipv4/tcp_timer.c:127 [inline] BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:369 [inline] BUG: KASAN: use-after-free in tcp_write_timer_handler+0xa4b/0xa60 net/ipv4/tcp_timer.c:597 Read of size 4 at addr ffff8880965a91a8 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.211-syzkaller #0 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+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_load4_noabort+0x88/0x90 mm/kasan/report.c:432 tcp_orphan_retries net/ipv4/tcp_timer.c:127 [inline] tcp_probe_timer net/ipv4/tcp_timer.c:369 [inline] tcp_write_timer_handler+0xa4b/0xa60 net/ipv4/tcp_timer.c:597 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: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: 48 89 df e8 f4 20 7f f9 e9 2e ff ff ff 48 89 df e8 e7 20 7f f9 eb 82 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 14 43 4e 00 fb f4 90 e9 07 00 00 00 0f 00 2d 04 43 4e 00 f4 c3 90 90 41 56 41 55 RSP: 0018:ffffffff89e07d40 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3054 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff89e78904 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f18290 R13: 1ffffffff13c0fb2 R14: 0000000000000000 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0x49/0x310 arch/x86/kernel/process.c:557 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x2ec/0x4b0 kernel/sched/idle.c:263 cpu_startup_entry+0xc5/0xe0 kernel/sched/idle.c:369 start_kernel+0x8d6/0x911 init/main.c:736 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Allocated by task 20802: 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 28: __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 ffff8880965a8a40 which belongs to the cache net_namespace of size 8704 The buggy address is located 1896 bytes inside of 8704-byte region [ffff8880965a8a40, ffff8880965aac40) The buggy address belongs to the page: page:ffffea0002596a00 count:1 mapcount:0 mapping:ffff88823b843e00 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0001527008 ffffea0002866708 ffff88823b843e00 raw: 0000000000000000 ffff8880965a8a40 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880965a9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880965a9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880965a9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880965a9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880965a9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 48 89 df mov %rbx,%rdi 3: e8 f4 20 7f f9 callq 0xf97f20fc 8: e9 2e ff ff ff jmpq 0xffffff3b d: 48 89 df mov %rbx,%rdi 10: e8 e7 20 7f f9 callq 0xf97f20fc 15: eb 82 jmp 0xffffff99 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: e9 07 00 00 00 jmpq 0x28 21: 0f 00 2d 14 43 4e 00 verw 0x4e4314(%rip) # 0x4e433c 28: fb sti 29: f4 hlt * 2a: c3 retq <-- trapping instruction 2b: 90 nop 2c: e9 07 00 00 00 jmpq 0x38 31: 0f 00 2d 04 43 4e 00 verw 0x4e4304(%rip) # 0x4e433c 38: f4 hlt 39: c3 retq 3a: 90 nop 3b: 90 nop 3c: 41 56 push %r14 3e: 41 55 push %r13