syz-executor675[8124]: segfault at 0 ip 00007f698c586af0 sp 00007ffdbefc7c68 error 4 in syz-executor675178470[7f698c520000+88000] Code: 66 0f ef c0 66 0f ef c9 66 0f ef d2 66 0f ef db 48 89 f8 48 89 f9 48 81 e1 ff 0f 00 00 48 81 f9 cf 0f 00 00 77 74 48 83 e0 f0 <66> 0f 74 00 66 0f 74 48 10 66 0f 74 50 20 66 0f 74 58 30 66 0f d7 WARNING: CPU: 0 PID: 8124 at include/linux/backing-dev.h:340 inode_to_wb include/linux/backing-dev.h:340 [inline] WARNING: CPU: 0 PID: 8124 at include/linux/backing-dev.h:340 account_page_dirtied+0x8cc/0xbb0 mm/page-writeback.c:2420 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8124 Comm: syz-executor675 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:inode_to_wb include/linux/backing-dev.h:340 [inline] RIP: 0010:account_page_dirtied+0x8cc/0xbb0 mm/page-writeback.c:2420 Code: 88 01 00 00 be ff ff ff ff 48 8d 78 70 e8 ec e1 ca ff 31 ff 89 c3 89 c6 e8 f1 b3 e2 ff 85 db 0f 85 39 f9 ff ff e8 74 b2 e2 ff <0f> 0b e9 2d f9 ff ff e8 68 b2 e2 ff 4c 89 e6 4c 89 ef e8 9d b3 2d RSP: 0018:ffff8880a26f7690 EFLAGS: 00010093 RAX: ffff8880b0bc81c0 RBX: 0000000000000000 RCX: ffffffff817fd2ef RDX: 0000000000000000 RSI: ffffffff817fd2fc RDI: 0000000000000005 RBP: ffff88808ffe2b60 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffffea000269c0c0 R13: ffff88808ffe29d8 R14: ffff8880b021aab0 R15: ffffea000269c0c8 __set_page_dirty+0x7f/0x3e0 fs/buffer.c:582 mark_buffer_dirty+0x424/0x5c0 fs/buffer.c:1111 gfs2_unpin+0xd6/0xe80 fs/gfs2/lops.c:108 buf_lo_after_commit+0x140/0x210 fs/gfs2/lops.c:512 lops_after_commit fs/gfs2/lops.h:67 [inline] gfs2_log_flush+0x9fa/0x1ef0 fs/gfs2/log.c:831 gfs2_kill_sb+0x54/0x1a0 fs/gfs2/ops_fstype.c:1383 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x277/0x2d0 arch/x86/entry/common.c:198 retint_user+0x8/0x18 RIP: 0033:0x7f698c586af0 Code: Bad RIP value. RSP: 002b:00007ffdbefc7c68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000000000e0 RCX: 0000000000000000 RDX: 00000000000000e0 RSI: 00000000000000e0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000c0 R11: 00000000000000e0 R12: 00000000ffffffff R13: 00007ffdbefc7d40 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess): 0: 66 0f ef c0 pxor %xmm0,%xmm0 4: 66 0f ef c9 pxor %xmm1,%xmm1 8: 66 0f ef d2 pxor %xmm2,%xmm2 c: 66 0f ef db pxor %xmm3,%xmm3 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f9 mov %rdi,%rcx 16: 48 81 e1 ff 0f 00 00 and $0xfff,%rcx 1d: 48 81 f9 cf 0f 00 00 cmp $0xfcf,%rcx 24: 77 74 ja 0x9a 26: 48 83 e0 f0 and $0xfffffffffffffff0,%rax * 2a: 66 0f 74 00 pcmpeqb (%rax),%xmm0 <-- trapping instruction 2e: 66 0f 74 48 10 pcmpeqb 0x10(%rax),%xmm1 33: 66 0f 74 50 20 pcmpeqb 0x20(%rax),%xmm2 38: 66 0f 74 58 30 pcmpeqb 0x30(%rax),%xmm3 3d: 66 data16 3e: 0f .byte 0xf 3f: d7 xlat %ds:(%rbx)