bisecting fixing commit since 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 building syzkaller on 77e2b66864e69c17416614228723a1ebd3581ddc testing commit 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 with gcc (GCC) 8.4.1 20210217 kernel signature: 8f0df1f8a9a4b4075791befd17ce6739e350d47a3d02571da4fa28f888a568a7 run #0: crashed: kernel BUG in ext4_write_inline_data_end run #1: crashed: kernel BUG in ext4_write_inline_data_end run #2: crashed: kernel BUG in ext4_write_inline_data_end run #3: crashed: kernel BUG in ext4_write_inline_data_end run #4: crashed: kernel BUG in ext4_write_inline_data_end run #5: crashed: kernel BUG in __block_commit_write run #6: crashed: kernel BUG in ext4_write_inline_data_end run #7: crashed: kernel BUG in ext4_write_inline_data_end run #8: crashed: kernel BUG in ext4_write_inline_data_end run #9: crashed: kernel BUG in __block_commit_write run #10: crashed: kernel BUG in ext4_write_inline_data_end run #11: crashed: kernel BUG in ext4_write_inline_data_end run #12: crashed: kernel BUG in ext4_write_inline_data_end run #13: crashed: kernel BUG in __block_commit_write run #14: crashed: kernel BUG in ext4_write_inline_data_end run #15: crashed: kernel BUG in ext4_write_inline_data_end run #16: crashed: kernel BUG in __block_commit_write run #17: crashed: kernel BUG in ext4_write_inline_data_end run #18: crashed: kernel BUG in __block_commit_write run #19: crashed: kernel BUG in ext4_write_inline_data_end testing current HEAD 1722257b8ececec9b3b83a8b14058f8209d78071 testing commit 1722257b8ececec9b3b83a8b14058f8209d78071 with gcc (GCC) 8.4.1 20210217 kernel signature: 6c616b45b07aa3f8484294a0bf41fc950b42adcbadc7facd85279b9010517e8c run #0: crashed: kernel BUG in ext4_write_inline_data_end run #1: crashed: kernel BUG in ext4_write_inline_data_end run #2: crashed: kernel BUG in ext4_write_inline_data_end run #3: crashed: kernel BUG in __block_commit_write run #4: crashed: kernel BUG in ext4_write_inline_data_end run #5: crashed: kernel BUG in ext4_write_inline_data_end run #6: crashed: kernel BUG in __block_commit_write run #7: crashed: kernel BUG in ext4_write_inline_data_end run #8: crashed: kernel BUG in __block_commit_write run #9: crashed: kernel BUG in ext4_write_inline_data_end revisions tested: 2, total time: 26m13.891249576s (build: 18m35.366210999s, test: 7m10.538055744s) the crash still happens on HEAD commit msg: Linux 4.19.193 crash: kernel BUG in ext4_write_inline_data_end ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 EXT4-fs: failed to create workqueue EXT4-fs (loop3): mount failed ------------[ cut here ]------------ kernel BUG at fs/ext4/inline.c:751! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13864 Comm: syz-executor.5 Not tainted 4.19.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ext4_write_inline_data_end+0x398/0x530 fs/ext4/inline.c:751 Code: f9 48 c1 e9 03 80 3c 11 00 0f 85 5e 01 00 00 48 8b 7b 28 89 c1 ba e9 02 00 00 48 c7 c6 00 d9 18 88 e8 ac eb 0d 00 31 c0 eb 8e <0f> 0b 49 8d 78 08 48 89 f8 48 c1 e8 03 80 3c 10 00 0f 85 5c 01 00 RSP: 0018:ffff88807d95f320 EFLAGS: 00010246 RAX: 0000000800000000 RBX: ffff888080ee93b0 RCX: 1ffff110101dd242 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888080ee9270 RBP: ffff88807d95f3d0 R08: 0000000000006eb1 R09: ffffffff8b5e3a88 R10: ffff888094718b58 R11: 0000000000000001 R12: ffffea000204e180 R13: 1ffff1100fb2be69 R14: ffff88807d95f368 R15: ffff88807d95f3a8 FS: 00007f483d24a700(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe134bdba8 CR3: 00000000a0396000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_write_end+0x167/0xb10 fs/ext4/inode.c:1423 ext4_da_write_end+0x622/0x9b0 fs/ext4/inode.c:3170 generic_perform_write+0x2e3/0x480 mm/filemap.c:3181 __generic_file_write_iter+0x3e9/0x590 mm/filemap.c:3263 ext4_file_write_iter+0x281/0xe50 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] do_iter_readv_writev+0x4ae/0x960 fs/read_write.c:681 do_iter_write fs/read_write.c:960 [inline] do_iter_write+0x12a/0x510 fs/read_write.c:941 vfs_iter_write+0x5b/0xb0 fs/read_write.c:973 iter_file_splice_write+0x55d/0xc40 fs/splice.c:750 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x104/0x1c0 fs/splice.c:1025 splice_direct_to_actor+0x304/0x870 fs/splice.c:980 do_splice_direct+0x14c/0x270 fs/splice.c:1068 do_sendfile+0x490/0xd20 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x100/0x120 fs/read_write.c:1494 __x64_sys_sendfile64+0x92/0xf0 fs/read_write.c:1494 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f483d24a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff73a6239f R14: 00007f483d24a300 R15: 0000000000022000 Modules linked in: ---[ end trace b709bb7e006794e2 ]--- RIP: 0010:ext4_write_inline_data_end+0x398/0x530 fs/ext4/inline.c:751 Code: f9 48 c1 e9 03 80 3c 11 00 0f 85 5e 01 00 00 48 8b 7b 28 89 c1 ba e9 02 00 00 48 c7 c6 00 d9 18 88 e8 ac eb 0d 00 31 c0 eb 8e <0f> 0b 49 8d 78 08 48 89 f8 48 c1 e8 03 80 3c 10 00 0f 85 5c 01 00 RSP: 0018:ffff88807d95f320 EFLAGS: 00010246 RAX: 0000000800000000 RBX: ffff888080ee93b0 RCX: 1ffff110101dd242 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888080ee9270 RBP: ffff88807d95f3d0 R08: 0000000000006eb1 R09: ffffffff8b5e3a88 R10: ffff888094718b58 R11: 0000000000000001 R12: ffffea000204e180 R13: 1ffff1100fb2be69 R14: ffff88807d95f368 R15: ffff88807d95f3a8 FS: 00007f483d24a700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9b7d5d8000 CR3: 00000000a0396000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400