bisecting fixing commit since ff33472c282e209da54cbc0c7c1c06ddfcc93d33 building syzkaller on c85e1c5be98819e885698b690ac15a8d05ae38a6 testing commit ff33472c282e209da54cbc0c7c1c06ddfcc93d33 with gcc (GCC) 8.1.0 kernel signature: b2166d0577c628ebac2a0d02b4dd142a18b8a057 all runs: crashed: WARNING in ext4_set_page_dirty testing current HEAD c1141b3aab36eb0d9b2bcae4aff69e77d0554386 testing commit c1141b3aab36eb0d9b2bcae4aff69e77d0554386 with gcc (GCC) 8.1.0 kernel signature: 610ed36a3b4b17464c49850c62ceb4b7122699cb all runs: crashed: WARNING in ext4_set_page_dirty revisions tested: 2, total time: 24m0.006916647s (build: 16m45.973521237s, test: 6m42.127869559s) the crash still happens on HEAD commit msg: Linux 4.14.166 crash: WARNING in ext4_set_page_dirty audit: type=1804 audit(1579328920.529:258): pid=7640 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir977900455/syzkaller.RYbZZ1/15/bus" dev="sda1" ino=16549 res=1 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7874 at fs/ext4/inode.c:3875 ext4_set_page_dirty+0xd0/0x110 fs/ext4/inode.c:3877 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7874 Comm: syz-executor.1 Not tainted 4.14.166-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+0xf7/0x13b lib/dump_stack.c:58 panic+0x1b0/0x358 kernel/panic.c:183 __warn.cold.8+0x25/0x2c kernel/panic.c:547 report_bug+0x1a4/0x1f3 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:ext4_set_page_dirty+0xd0/0x110 fs/ext4/inode.c:3875 RSP: 0018:ffff8880735e79d8 EFLAGS: 00010246 RAX: 01fffc0000000029 RBX: ffffea00022ddd00 RCX: 1ffff11012a32cb7 RDX: 1ffffd400045bba0 RSI: 00000000ffffffff RDI: ffffea00022ddd00 RBP: ffff8880735e79f0 R08: 0000000000000000 R09: ffff8880735e7d68 R10: ffffea00022ddd00 R11: ffff8880735e7d08 R12: ffffea00022ddd00 R13: ffffea00022ddd20 R14: ffffffff81bd9c90 R15: dffffc0000000000 set_page_dirty+0x153/0x2a0 mm/page-writeback.c:2586 set_page_dirty_lock+0x56/0x80 mm/page-writeback.c:2611 process_vm_rw_pages mm/process_vm_access.c:51 [inline] process_vm_rw_single_vec mm/process_vm_access.c:124 [inline] process_vm_rw_core.isra.1+0x4bd/0x9b0 mm/process_vm_access.c:223 process_vm_rw+0x19b/0x1c0 mm/process_vm_access.c:290 SYSC_process_vm_writev mm/process_vm_access.c:312 [inline] SyS_process_vm_writev+0xb/0x10 mm/process_vm_access.c:307 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459829 RSP: 002b:00007fa5eeb09c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000137 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459829 RDX: 0000000000000001 RSI: 0000000020000540 RDI: 000000000000006a RBP: 000000000075c070 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000200003c0 R11: 0000000000000246 R12: 00007fa5eeb0a6d4 R13: 00000000004c6b42 R14: 00000000004dbc18 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..