syzbot


UBSAN: shift-out-of-bounds in gfs2_getbuf

Status: auto-obsoleted due to no activity on 2023/04/13 15:51
Subsystems: gfs2
[Documentation on labels]
Reported-by: syzbot+87a187973530ac822e3c@syzkaller.appspotmail.com
First crash: 522d, last: 522d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] UBSAN: shift-out-of-bounds in gfs2_getbuf 1 (3) 2022/10/13 14:58
Last patch testing requests (4)
Created Duration User Patch Repo Result
2023/04/13 15:11 20m retest repro upstream OK log
2023/02/21 01:32 29m retest repro upstream OK log
2023/01/22 12:32 20m retest repro upstream OK log
2023/01/21 17:32 24m retest repro upstream OK log

Sample crash report:
loop0: detected capacity change from 0 to 264192
gfs2: fsid=loop0: Trying to join cluster "lock_nolock", "loop0"
gfs2: fsid=loop0: Now mounting FS (format 1801)...
================================================================================
UBSAN: shift-out-of-bounds in fs/gfs2/meta_io.c:128:16
shift exponent 4294967293 is too large for 64-bit type 'u64' (aka 'unsigned long long')
CPU: 1 PID: 3605 Comm: syz-executor208 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 gfs2_getbuf+0x759/0x7d0 fs/gfs2/meta_io.c:128
 gfs2_meta_read+0x153/0x910 fs/gfs2/meta_io.c:265
 gfs2_meta_buffer+0x153/0x3a0 fs/gfs2/meta_io.c:491
 gfs2_meta_inode_buffer fs/gfs2/meta_io.h:72 [inline]
 gfs2_inode_refresh+0xab/0xe90 fs/gfs2/glops.c:472
 gfs2_instantiate+0x15e/0x220 fs/gfs2/glock.c:515
 gfs2_glock_holder_ready fs/gfs2/glock.c:1303 [inline]
 gfs2_glock_wait+0x1d9/0x2a0 fs/gfs2/glock.c:1323
 gfs2_glock_nq_init fs/gfs2/glock.h:263 [inline]
 gfs2_lookupi+0x40c/0x650 fs/gfs2/inode.c:306
 gfs2_lookup_simple+0xec/0x170 fs/gfs2/inode.c:258
 init_journal+0x19b/0x22c0 fs/gfs2/ops_fstype.c:739
 init_inodes+0xdc/0x340 fs/gfs2/ops_fstype.c:882
 gfs2_fill_super+0x1ad8/0x2610 fs/gfs2/ops_fstype.c:1240
 get_tree_bdev+0x400/0x620 fs/super.c:1323
 gfs2_get_tree+0x50/0x210 fs/gfs2/ops_fstype.c:1323
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd436bdc42a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca30177e8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fd436bdc42a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffca3017800
RBP: 00007ffca3017800 R08: 00007ffca3017840 R09: 000055555600f2c0
R10: 0000000000000008 R11: 0000000000000282 R12: 0000000000000004
R13: 00007ffca3017840 R14: 0000000000000001 R15: 0000000020000218
 </TASK>
================================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/13 15:44 upstream 493ffd6605b2 adf90437 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci2-upstream-fs UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 15:24 upstream 55be6084c8e0 adf90437 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 15:11 upstream 493ffd6605b2 adf90437 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci2-upstream-fs UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 14:58 upstream 55be6084c8e0 adf90437 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 17:06 upstream 55be6084c8e0 adf90437 .config console log report info ci-upstream-kasan-gce-selinux-root UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 14:42 upstream 55be6084c8e0 adf90437 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 14:05 upstream 55be6084c8e0 adf90437 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in gfs2_getbuf
2022/10/13 13:22 upstream 493ffd6605b2 adf90437 .config console log report info [disk image] [vmlinux] ci2-upstream-fs UBSAN: shift-out-of-bounds in gfs2_getbuf
* Struck through repros no longer work on HEAD.