Hello, syzbot found the following crash on: HEAD commit: 189522da Merge tag 'for_linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16747530100000 kernel config: https://syzkaller.appspot.com/x/.config?x=78a7d8adda44b4b dashboard link: https://syzkaller.appspot.com/bug?extid=df958cf5688a96ad3287 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11e45dbfe00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11b5b36fe00000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12a81dc8100000 final crash: https://syzkaller.appspot.com/x/report.txt?x=11a81dc8100000 console output: https://syzkaller.appspot.com/x/log.txt?x=16a81dc8100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+df958cf5688a96ad3287@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7023 at fs/inode.c:303 drop_nlink+0xb9/0x100 fs/inode.c:303 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7023 Comm: syz-executor433 Not tainted 5.7.0-rc2-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+0x1e9/0x30e lib/dump_stack.c:118 panic+0x264/0x7a0 kernel/panic.c:221 __warn+0x209/0x210 kernel/panic.c:582 report_bug+0x1ac/0x2d0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:drop_nlink+0xb9/0x100 fs/inode.c:303 Code: 49 8b 1e 48 8d bb b8 07 00 00 be 08 00 00 00 e8 fd 65 ef ff f0 48 ff 83 b8 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 f7 b8 b1 ff <0f> 0b eb 8a 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 63 ff ff ff 4c RSP: 0018:ffffc900015d7da0 EFLAGS: 00010293 RAX: ffffffff81c1a899 RBX: 1ffff11010d63ab1 RCX: ffff8880a7e88200 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff81c1a81e R09: ffffed1010d63ab9 R10: ffffed1010d63ab9 R11: 0000000000000000 R12: ffff888086b1d588 R13: 1ffff110114efcf2 R14: ffff888086b1d540 R15: dffffc0000000000 inode_dec_link_count include/linux/fs.h:2210 [inline] minix_unlink+0xc7/0x100 fs/minix/namei.c:164 vfs_unlink+0x30c/0x5a0 fs/namei.c:3809 do_unlinkat+0x377/0x7e0 fs/namei.c:3873 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x449ac7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8d cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe753dcec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000449ac7 RDX: 0000000001fb39e3 RSI: 00007ffe753dcee0 RDI: 00007ffe753dcf70 RBP: 0000000000000002 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000003 R11: 0000000000000246 R12: 0000000001fb3980 R13: 00007ffe753de060 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
