bisecting fixing commit since 10b84daddbec72c6b440216a69de9a9605127f7a building syzkaller on 0174c6c8f78a3fdd002a73a5fdf559c1b0ec8c34 testing commit 10b84daddbec72c6b440216a69de9a9605127f7a with gcc (GCC) 8.1.0 kernel signature: d3c9c90e128129c6c5d81a6e39299be19c3536be5c6b82f2200512cf51cddecc all runs: crashed: WARNING in account_page_dirtied testing current HEAD 15bc20c6af4ceee97a1f90b43c0e386643c071b4 testing commit 15bc20c6af4ceee97a1f90b43c0e386643c071b4 with gcc (GCC) 8.1.0 kernel signature: 218a06e1eea60897f3f3e467f1976008c71f0bb9d8a68fc8055f953c8e9dc9f6 run #0: crashed: WARNING in account_page_dirtied run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in account_page_dirtied run #3: crashed: WARNING in account_page_dirtied run #4: crashed: WARNING in account_page_dirtied run #5: crashed: WARNING in account_page_dirtied run #6: crashed: WARNING in account_page_dirtied run #7: crashed: WARNING in account_page_dirtied run #8: crashed: WARNING in account_page_dirtied run #9: crashed: WARNING in account_page_dirtied revisions tested: 2, total time: 14m52.528235456s (build: 7m59.035491821s, test: 6m13.123412975s) the crash still happens on HEAD commit msg: Merge tag 'tty-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty crash: WARNING in account_page_dirtied gfs2: fsid=loop5.0: first mount done, others may mount gfs2: fsid=loop4.0: jid=0, already locked for use gfs2: fsid=loop4.0: jid=0: Looking at journal... gfs2: fsid=loop2.0: found 1 quota changes ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3664 at include/linux/backing-dev.h:338 inode_to_wb include/linux/backing-dev.h:335 [inline] WARNING: CPU: 1 PID: 3664 at include/linux/backing-dev.h:338 account_page_dirtied+0x265/0x300 mm/page-writeback.c:2430 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3664 Comm: syz-executor Not tainted 5.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 gfs2: fsid=loop5.0: found 1 quota changes Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xb9/0xf1 lib/dump_stack.c:118 panic+0x115/0x30c kernel/panic.c:231 __warn.cold.13+0x20/0x26 kernel/panic.c:600 report_bug+0xc5/0x100 lib/bug.c:198 handle_bug+0x39/0xa0 arch/x86/kernel/traps.c:234 exc_invalid_op+0x18/0x70 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:inode_to_wb include/linux/backing-dev.h:335 [inline] RIP: 0010:account_page_dirtied+0x265/0x300 mm/page-writeback.c:2430 gfs2: fsid=loop1.0: found 1 quota changes Code: e8 40 6f a4 01 85 c0 0f 85 36 fe ff ff 49 8b 86 a8 01 00 00 be ff ff ff ff 48 8d 78 70 e8 23 6f a4 01 85 c0 0f 85 19 fe ff ff <0f> 0b e9 12 fe ff ff 4c 89 e6 4c 89 f7 e8 a9 2d 0f 00 e9 f4 fd ff RSP: 0018:ffffc9000036baa8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffea0008085bc0 RCX: 0000000000000000 RDX: ffff88820f3b8500 RSI: ffff888216ff70d0 RDI: 0000000000000082 RBP: ffffc9000036bac8 R08: 0000000000000231 R09: 0000000000000001 R10: 0000000000000001 R11: ec728b3263e4ab96 R12: ffffea0008085bc0 R13: ffff888205da8c28 R14: ffff8882150d4258 R15: 0000000000000000 __set_page_dirty+0x52/0xc0 fs/buffer.c:608 mark_buffer_dirty+0x118/0x170 fs/buffer.c:1137 gfs2_unpin+0x63/0x350 fs/gfs2/lops.c:107 buf_lo_after_commit+0x58/0x70 fs/gfs2/lops.c:739 lops_after_commit fs/gfs2/lops.h:62 [inline] gfs2_log_flush+0x49f/0xdd0 fs/gfs2/log.c:974 do_sync+0x21f/0x540 fs/gfs2/quota.c:967 gfs2_quota_sync+0x177/0x220 fs/gfs2/quota.c:1310 gfs2_sync_fs+0x1b/0x50 fs/gfs2/super.c:752 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem+0x3d/0x90 fs/sync.c:64 generic_shutdown_super+0x22/0x100 fs/super.c:448 kill_block_super+0x22/0x50 fs/super.c:1444 gfs2_kill_sb+0x63/0x70 fs/gfs2/ops_fstype.c:1603 deactivate_locked_super+0x30/0x70 fs/super.c:335 deactivate_super+0x4c/0x50 fs/super.c:366 cleanup_mnt+0xb8/0x140 fs/namespace.c:1118 __cleanup_mnt+0xd/0x10 fs/namespace.c:1125 task_work_run+0x6d/0xc0 kernel/task_work.c:141 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:140 [inline] exit_to_user_mode_prepare+0x1b0/0x1c0 kernel/entry/common.c:167 syscall_exit_to_user_mode+0x63/0x290 kernel/entry/common.c:242 do_syscall_64+0x43/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x457a57 Code: 44 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffb1078ff8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000457a57 RDX: 0000000001b6f9db RSI: 0000000000000002 RDI: 00007fffb107a160 RBP: 00007fffb107a160 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000001b6f940 R13: 0000000000000000 R14: 0000000000000002 R15: 000000000000cd1c Kernel Offset: disabled Rebooting in 86400 seconds..