bisecting fixing commit since 614cb2751d3150850d459bee596c397f344a7936
building syzkaller on a2fe1cb58994e43fb14f141ecd6e6dcce9bb697a
testing commit 614cb2751d3150850d459bee596c397f344a7936
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: a3a85bce4f45999e30949326e2fab7cc4578e19f6b96ef7dbd2ad10521d11990
all runs: crashed: kernel BUG in ext4_get_group_info
testing current HEAD 8ab774587903771821b59471cc723bba6d893942
testing commit 8ab774587903771821b59471cc723bba6d893942
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 1aec3460b50c82f9e78bf84bf4182dae19e27ad75062bdfd125f889cffce009f
all runs: crashed: kernel BUG in ext4_get_group_info
revisions tested: 2, total time: 22m57.216577921s (build: 12m46.067908077s, test: 9m31.396776281s)
the crash still happens on HEAD
commit msg: Merge tag 'trace-v5.16-5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
crash: kernel BUG in ext4_get_group_info
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4.h:3358!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 11173 Comm: syz-executor.4 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:3358 [inline]
RIP: 0010:ext4_get_group_info+0x280/0x2e0 fs/ext4/ext4.h:3353
Code: 0f 85 a8 fe ff ff 48 c7 c2 a0 36 ff 88 be b1 02 00 00 48 c7 c7 60 2f ff 88 c6 05 c6 75 98 0a 01 e8 44 d9 4e 06 e9 84 fe ff ff <0f> 0b e8 a9 df b4 ff e9 d4 fd ff ff e8 9f df b4 ff e9 fc fd ff ff
RSP: 0018:ffffc9000ae075c8 EFLAGS: 00010213
RAX: 0000000000000000 RBX: ffff88805f650000 RCX: 0000000000000001
RDX: 1ffff1100beca008 RSI: 00000000fffff95a RDI: ffff88805f650040
RBP: ffff88807bd30000 R08: 0000000000000000 R09: ffff88806c024d6b
R10: ffffed100d8049ad R11: 0000000000000038 R12: 00000000fffff95a
R13: ffff88807bd30678 R14: ffffc9000ae07708 R15: ffff88807bd30000
FS:  00007f5ad8d4d700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007f531000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_load_buddy_gfp+0xc4/0x1280 fs/ext4/mballoc.c:1494
 ext4_discard_preallocations+0x768/0xc60 fs/ext4/mballoc.c:5011
 ext4_truncate+0x4c5/0x10c0 fs/ext4/inode.c:4198
 ext4_truncate_failed_write fs/ext4/truncate.h:22 [inline]
 ext4_write_begin+0x7bb/0xff0 fs/ext4/inode.c:1235
 ext4_da_write_begin+0x468/0x840 fs/ext4/inode.c:2941
 generic_perform_write+0x1c7/0x440 mm/filemap.c:3756
 ext4_buffered_write_iter+0x171/0x330 fs/ext4/file.c:269
 ext4_file_write_iter+0x383/0x1160 fs/ext4/file.c:681
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write+0x360/0x600 fs/read_write.c:503
 vfs_write+0x609/0x900 fs/read_write.c:590
 ksys_write+0xf4/0x1d0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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:00007f5ad8d4d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 000000000d4ba0ff RSI: 00000000200009c0 RDI: 0000000000000007
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd8b321a8f R14: 00007f5ad8d4d300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace f48b8443e32592a4 ]---
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:3358 [inline]
RIP: 0010:ext4_get_group_info+0x280/0x2e0 fs/ext4/ext4.h:3353
Code: 0f 85 a8 fe ff ff 48 c7 c2 a0 36 ff 88 be b1 02 00 00 48 c7 c7 60 2f ff 88 c6 05 c6 75 98 0a 01 e8 44 d9 4e 06 e9 84 fe ff ff <0f> 0b e8 a9 df b4 ff e9 d4 fd ff ff e8 9f df b4 ff e9 fc fd ff ff
RSP: 0018:ffffc9000ae075c8 EFLAGS: 00010213
RAX: 0000000000000000 RBX: ffff88805f650000 RCX: 0000000000000001
RDX: 1ffff1100beca008 RSI: 00000000fffff95a RDI: ffff88805f650040
RBP: ffff88807bd30000 R08: 0000000000000000 R09: ffff88806c024d6b
R10: ffffed100d8049ad R11: 0000000000000038 R12: 00000000fffff95a
R13: ffff88807bd30678 R14: ffffc9000ae07708 R15: ffff88807bd30000
FS:  00007f5ad8d4d700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007f531000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400