bisecting fixing commit since 23d04328444a8fa0ca060c5e532220dac8e8bc26
building syzkaller on 6e821dbf79b49f1952fc147f237aa0f396790edc
testing commit 23d04328444a8fa0ca060c5e532220dac8e8bc26
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: a2bfa21357176c6aff52ba222ccb8173721411139888735ed6feb20f391c8347
all runs: crashed: UBSAN: shift-out-of-bounds in minix_count_free_blocks
testing current HEAD af2d861d4cd2a4da5137f795ee3509e6f944a25b
testing commit af2d861d4cd2a4da5137f795ee3509e6f944a25b
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 20b9a4d084b4c79b17d65002ae7947080c50698730167c62f28d41803c852dfd
all runs: crashed: UBSAN: shift-out-of-bounds in minix_count_free_blocks
revisions tested: 2, total time: 18m25.545624732s (build: 12m8.646685222s, test: 5m45.047839139s)
the crash still happens on HEAD
commit msg: Linux 5.18-rc4
crash: UBSAN: shift-out-of-bounds in minix_count_free_blocks
================================================================================
UBSAN: shift-out-of-bounds in fs/minix/bitmap.c:103:3
shift exponent 34 is too large for 32-bit type 'unsigned int'
CPU: 0 PID: 3996 Comm: syz-executor.4 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 ubsan_epilogue+0x5/0x36 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds.cold+0x61/0xef lib/ubsan.c:322
 minix_count_free_blocks.cold+0x14/0x1c fs/minix/bitmap.c:103
 minix_statfs+0x20e/0x480 fs/minix/inode.c:381
 statfs_by_dentry+0x11b/0x1e0 fs/statfs.c:66
 vfs_statfs fs/statfs.c:90 [inline]
 user_statfs+0x91/0x110 fs/statfs.c:105
 __do_sys_statfs+0x6b/0xc0 fs/statfs.c:195
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fcb45e89059
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb47087168 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
RAX: ffffffffffffffda RBX: 00007fcb45f9bf60 RCX: 00007fcb45e89059
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140
RBP: 00007fcb45ee308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa9fe2e3f R14: 00007fcb47087300 R15: 0000000000022000
 </TASK>
================================================================================