================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_mount.c:373:25 shift exponent -2292 is negative CPU: 1 PID: 10958 Comm: syz-executor.1 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 chkSuper.cold+0x1e/0x85 fs/jfs/jfs_mount.c:373 jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:82 jfs_fill_super+0x5b1/0xbc0 fs/jfs/super.c:562 mount_bdev+0x34d/0x410 fs/super.c:1366 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1496 do_new_mount fs/namespace.c:2878 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3208 do_mount fs/namespace.c:3221 [inline] __do_sys_mount fs/namespace.c:3429 [inline] __se_sys_mount fs/namespace.c:3406 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3406 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460c6a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f7342af9a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7342af9b10 RCX: 0000000000460c6a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f7342af9ad0 RBP: 00007f7342af9ad0 R08: 00007f7342af9b10 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000080 ================================================================================