audit: type=1804 audit(1614046099.943:396): pid=30514 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir719148418/syzkaller.DYs7wp/1119/file0/bus" dev="loop5" ino=67 res=1 FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) ================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x245f/0x28c0 net/ipv4/tcp_timer.c:471 Read of size 8 at addr ffff8880a03c8378 by task swapper/1/0 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.221-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 tcp_retransmit_timer+0x245f/0x28c0 net/ipv4/tcp_timer.c:471 tcp_write_timer_handler+0x434/0x780 net/ipv4/tcp_timer.c:583 tcp_write_timer+0xc8/0x160 net/ipv4/tcp_timer.c:601 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __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:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 RSP: 0018:ffff8880b5477e68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1254 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880b5468bc4 RBP: ffffffff88f09290 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1016a8d068 R13: ffff8880b5468340 R14: 0000000000000000 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0x47/0x370 arch/x86/kernel/process.c:558 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x250/0x3c0 kernel/sched/idle.c:246 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351 start_secondary+0x4db/0x670 arch/x86/kernel/smpboot.c:272 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 Allocated by task 4629: 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+0x124/0x3c0 mm/slab.c:3552 getname_flags+0xc8/0x550 fs/namei.c:138 user_path_at_empty+0x2a/0x50 fs/namei.c:2631 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xd1/0x180 fs/stat.c:185 vfs_lstat include/linux/fs.h:3070 [inline] SYSC_newlstat fs/stat.c:350 [inline] SyS_newlstat+0x83/0xe0 fs/stat.c:344 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 4629: 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] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 putname+0xcd/0x110 fs/namei.c:259 filename_lookup+0x37b/0x510 fs/namei.c:2386 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xd1/0x180 fs/stat.c:185 vfs_lstat include/linux/fs.h:3070 [inline] SYSC_newlstat fs/stat.c:350 [inline] SyS_newlstat+0x83/0xe0 fs/stat.c:344 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880a03c86c0 which belongs to the cache names_cache of size 4096 The buggy address is located 840 bytes to the left of 4096-byte region [ffff8880a03c86c0, ffff8880a03c96c0) The buggy address belongs to the page: page:ffffea000280f200 count:1 mapcount:0 mapping:ffff8880a03c86c0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880a03c86c0 0000000000000000 0000000100000001 raw: ffffea0002593fa0 ffffea000280f2a0 ffff88823f8bb200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a03c8200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a03c8280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a03c8300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a03c8380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a03c8400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================