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UBSAN: Undefined behaviour in fs/jfs/jfs_mount.c:372:25
shift exponent -9716 is negative
CPU: 1 PID: 10716 Comm: syz-executor.1 Not tainted 5.3.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x86/0xca lib/dump_stack.c:113
 ubsan_epilogue+0xd/0x3a lib/ubsan.c:158
 __ubsan_handle_shift_out_of_bounds.cold.14+0x21/0x68 lib/ubsan.c:404
 chkSuper.cold.1+0x22/0xbf fs/jfs/jfs_mount.c:372
 jfs_mount+0x45/0x340 fs/jfs/jfs_mount.c:81
 jfs_fill_super+0x526/0xb00 fs/jfs/super.c:560
 mount_bdev+0x26f/0x330 fs/super.c:1283
 jfs_do_mount+0x10/0x20 fs/jfs/super.c:674
 legacy_get_tree+0x105/0x200 fs/fs_context.c:661
 vfs_get_tree+0x86/0x3c0 fs/super.c:1413
 do_new_mount fs/namespace.c:2791 [inline]
 do_mount+0x11da/0x1b90 fs/namespace.c:3111
 ksys_mount+0xba/0xe0 fs/namespace.c:3320
 __do_sys_mount fs/namespace.c:3334 [inline]
 __se_sys_mount fs/namespace.c:3331 [inline]
 __x64_sys_mount+0xb9/0x150 fs/namespace.c:3331
 do_syscall_64+0x96/0x450 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460baa
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:00007f2d4c007a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2d4c007b10 RCX: 0000000000460baa
RDX: 0000000020000000 RSI: 0000000020000080 RDI: 00007f2d4c007ad0
RBP: 00007f2d4c007ad0 R08: 00007f2d4c007b10 R09: 0000000020000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000080 R14: 0000000020000200 R15: 00000000200001c0
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