bisecting fixing commit since 1ec8f1f0bffe34ebdf95dbe0fd4a6635a84612a8
building syzkaller on c402d8f1aa5d2fdc219d2155fa467fb7f02321a5
testing commit 1ec8f1f0bffe34ebdf95dbe0fd4a6635a84612a8 with gcc (GCC) 8.1.0
kernel signature: 8228b5ca95f736a96c31b151bfb981a634501cba
all runs: crashed: WARNING in dio_complete
testing current HEAD 43598c571e7ed29e4c81e35b4a870fe6b9f8d58e
testing commit 43598c571e7ed29e4c81e35b4a870fe6b9f8d58e with gcc (GCC) 8.1.0
kernel signature: 2b7b203284fd1c0308f469dbcd7f664a28ca931a
run #0: crashed: WARNING in ext4_set_page_dirty
run #1: crashed: WARNING in ext4_set_page_dirty
run #2: crashed: WARNING in ext4_set_page_dirty
run #3: crashed: WARNING in ext4_set_page_dirty
run #4: crashed: WARNING in ext4_set_page_dirty
run #5: crashed: WARNING in ext4_set_page_dirty
run #6: crashed: WARNING in ext4_set_page_dirty
run #7: crashed: WARNING in ext4_set_page_dirty
run #8: crashed: WARNING in ext4_set_page_dirty
run #9: OK
revisions tested: 2, total time: 30m20.498660663s (build: 15m18.558974103s, test: 14m14.991616791s)
the crash still happens on HEAD
commit msg: Linux 4.14.156
crash: WARNING in ext4_set_page_dirty
audit: type=1804 audit(1575008019.424:33981): pid=2630 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-testdir389329305/syzkaller.OIXkOn/3071/bus" dev="sda1" ino=16747 res=1
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3223 at fs/ext4/inode.c:3860 ext4_set_page_dirty+0xd0/0x110 fs/ext4/inode.c:3862
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3223 Comm: syz-executor.0 Not tainted 4.14.156-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+0x1b0/0x36a kernel/panic.c:183
 __warn.cold.8+0x25/0x2a 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:3860
RSP: 0018:ffff88807df579d8 EFLAGS: 00010246
RAX: 01fffc0000000029 RBX: ffffea0001f82cc0 RCX: 1ffff1100fa20117
RDX: 1ffffd40003f0598 RSI: ffff88807df579b0 RDI: ffffea0001f82cc0
RBP: ffff88807df579f0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0001f82cc0
R13: ffffea0001f82ce0 R14: ffffffff81be2290 R15: dffffc0000000000
 set_page_dirty+0x155/0x2a0 mm/page-writeback.c:2589
 set_page_dirty_lock+0x56/0x80 mm/page-writeback.c:2614
 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+0x1c9/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c29
RSP: 002b:00007f0f0848ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000137
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458c29
RDX: 0000000000000001 RSI: 0000000020000580 RDI: 0000000000003184
RBP: 000000000073bfa0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000020000600 R11: 0000000000000246 R12: 00007f0f0848f6d4
R13: 00000000004c598b R14: 00000000004d9d10 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..