bisecting fixing commit since 97a8651cadce7c2b7c4d8f108b392eff31fe2c08
building syzkaller on 77e2b66864e69c17416614228723a1ebd3581ddc
testing commit 97a8651cadce7c2b7c4d8f108b392eff31fe2c08 with gcc (GCC) 8.4.1 20210217
kernel signature: eea0be864012aacc81336e83b9833c63af59084ecd5f3a49a8c32b8eaa92f318
run #0: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #1: crashed: kernel BUG in corrupted
run #2: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #3: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #4: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #5: crashed: kernel BUG in corrupted
run #6: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #7: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #8: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #9: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #10: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #11: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #12: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #13: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #14: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #15: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #16: crashed: kernel BUG in corrupted
run #17: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #18: boot failed: can't ssh into the instance
run #19: boot failed: can't ssh into the instance
testing current HEAD fcfbdfe9626edd5bf00c732e093eed249ecdbfa1
testing commit fcfbdfe9626edd5bf00c732e093eed249ecdbfa1 with gcc (GCC) 8.4.1 20210217
kernel signature: 235d017b1e404dc36d380905437c9fae2e762cc489b775e23408e62f23f9521e
run #0: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #1: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #2: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #3: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #4: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #5: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #6: crashed: kernel BUG in corrupted
run #7: crashed: kernel BUG in ext4_mb_load_buddy_gfp
run #8: crashed: kernel BUG in corrupted
run #9: crashed: kernel BUG in ext4_mb_load_buddy_gfp
revisions tested: 2, total time: 30m11.415764083s (build: 15m59.19517825s, test: 13m49.829564751s)
the crash still happens on HEAD
commit msg: Linux 4.19.197
crash: kernel BUG in ext4_mb_load_buddy_gfp
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
EXT4-fs error (device sda1) in ext4_reserve_inode_write:5947: Out of memory
EXT4-fs error (device sda1): ext4_map_blocks:613: inode #4058: block 8800: comm modprobe: lblock 0 mapped to illegal pblock 8800 (length 1)
------------[ cut here ]------------
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #4058: lblock 0: comm modprobe: error -117 reading directory block
kernel BUG at fs/ext4/ext4.h:2870!
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #4058: lblock 0: comm modprobe: error -117 reading directory block
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #16704: lblock 0: comm modprobe: error -117 reading directory block
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #4058: lblock 0: comm modprobe: error -117 reading directory block
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
CPU: 0 PID: 9864 Comm: syz-executor.1 Not tainted 4.19.197-syzkaller #0
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0xfdd/0x1560 fs/ext4/mballoc.c:1116
Code: 0f 87 3c fc ff ff 4c 89 e7 e8 6f a9 a2 ff e9 93 fc ff ff e9 3d fa ff ff e9 9f f7 ff ff 4c 89 e7 e8 18 20 a8 ff e9 bd fb ff ff <0f> 0b 8b 55 bc 44 89 e6 4c 89 ff e8 53 de ff ff 85 c0 41 89 c5 0f
RSP: 0018:ffff88809bc47bd8 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffff88809bc47d50 RCX: 1ffff110147e1880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a3f0c400
RBP: ffff88809bc47c48 R08: 1ffff110130749a8 R09: ffffed10101b3f10
R10: ffffed10101b3f10 R11: ffff888080d9f883 R12: 00000000fffec511
R13: ffff8880a3f0c3c0 R14: ffff8880a3f0aa00 R15: ffff8880a3f0a380
FS:  0000000002a1c400(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc0d0fa5f0 CR3: 0000000099d2e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_discard_preallocations+0x9f1/0xe70 fs/ext4/mballoc.c:4089
 ext4_release_file+0x236/0x2b0 fs/ext4/file.c:98
 __fput+0x249/0x7f0 fs/file_table.c:278
 ____fput+0x9/0x10 fs/file_table.c:309
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x41940b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffd80094700 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000041940b
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e520134
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000056c9e0
R13: 000000000056c9e0 R14: 000000000056bf60 R15: 000000000000b975
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
Modules linked in:
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #4058: lblock 0: comm modprobe: error -117 reading directory block
---[ end trace 9f775396edf7f567 ]---
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #16704: lblock 0: comm modprobe: error -117 reading directory block
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0xfdd/0x1560 fs/ext4/mballoc.c:1116
EXT4-fs warning (device sda1): htree_dirblock_to_tree:995: inode #4058: lblock 0: comm modprobe: error -117 reading directory block
Code: 0f 87 3c fc ff ff 4c 89 e7 e8 6f a9 a2 ff e9 93 fc ff ff e9 3d fa ff ff e9 9f f7 ff ff 4c 89 e7 e8 18 20 a8 ff e9 bd fb ff ff <0f> 0b 8b 55 bc 44 89 e6 4c 89 ff e8 53 de ff ff 85 c0 41 89 c5 0f
Bluetooth: hci2: command 0x0419 tx timeout
Bluetooth: hci1: command 0x0419 tx timeout
RSP: 0018:ffff88809bc47bd8 EFLAGS: 00010282
Bluetooth: hci0: command 0x0419 tx timeout
RAX: dffffc0000000000 RBX: ffff88809bc47d50 RCX: 1ffff110147e1880
Bluetooth: hci4: command 0x0419 tx timeout
ieee80211 phy10: Selected rate control algorithm 'minstrel_ht'
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a3f0c400
Bluetooth: hci5: command 0x0419 tx timeout
RBP: ffff88809bc47c48 R08: 1ffff110130749a8 R09: ffffed10101b3f10
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
R10: ffffed10101b3f10 R11: ffff888080d9f883 R12: 00000000fffec511
R13: ffff8880a3f0c3c0 R14: ffff8880a3f0aa00 R15: ffff8880a3f0a380
FS:  0000000002a1c400(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564364adec30 CR3: 0000000099d2e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400