overlayfs: unrecognized mount option "ūSlowerdir=./file0" or missing value overlayfs: unrecognized mount option "ūSlowerdir=./file0" or missing value overlayfs: unrecognized mount option "ūSlowerdir=./file0" or missing value ================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2fc3/0x33f0 net/ipv4/tcp_timer.c:480 Read of size 8 at addr ffff888090ea8278 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_load8_noabort+0x88/0x90 mm/kasan/report.c:433 tcp_retransmit_timer+0x2fc3/0x33f0 net/ipv4/tcp_timer.c:480 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: 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 23807: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc_array include/linux/slab.h:637 [inline] realloc_func_state+0xd8/0x360 kernel/bpf/verifier.c:404 copy_func_state kernel/bpf/verifier.c:450 [inline] copy_verifier_state+0x40c/0x5d0 kernel/bpf/verifier.c:478 is_state_visited kernel/bpf/verifier.c:5157 [inline] do_check kernel/bpf/verifier.c:5237 [inline] bpf_check+0x19ca/0x9cc0 kernel/bpf/verifier.c:6508 bpf_prog_load+0xcce/0x1230 kernel/bpf/syscall.c:1450 __do_sys_bpf kernel/bpf/syscall.c:2423 [inline] __se_sys_bpf+0xf22/0x3a20 kernel/bpf/syscall.c:2384 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 23807: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 free_func_state kernel/bpf/verifier.c:425 [inline] free_func_state kernel/bpf/verifier.c:421 [inline] free_verifier_state kernel/bpf/verifier.c:435 [inline] free_states kernel/bpf/verifier.c:6424 [inline] bpf_check+0x30aa/0x9cc0 kernel/bpf/verifier.c:6516 bpf_prog_load+0xcce/0x1230 kernel/bpf/syscall.c:1450 __do_sys_bpf kernel/bpf/syscall.c:2423 [inline] __se_sys_bpf+0xf22/0x3a20 kernel/bpf/syscall.c:2384 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888090ea9600 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 5000 bytes to the left of 8192-byte region [ffff888090ea9600, ffff888090eab600) The buggy address belongs to the page: page:ffffea000243aa00 count:1 mapcount:0 mapping:ffff88813bff2080 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0002adbe08 ffffea0000db2a08 ffff88813bff2080 raw: 0000000000000000 ffff888090ea9600 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888090ea8100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888090ea8180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888090ea8200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888090ea8280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888090ea8300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- 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