================================================================================ UBSAN: shift-out-of-bounds in fs/jfs/jfs_extent.c:314:16 shift exponent -1 is negative CPU: 1 PID: 15248 Comm: syz-executor.0 Not tainted 6.5.0-rc7-syzkaller-00190-g85eb043618bb #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_shift_out_of_bounds+0x27a/0x600 lib/ubsan.c:387 extBalloc fs/jfs/jfs_extent.c:314 [inline] extAlloc.cold+0x8b/0xc5 fs/jfs/jfs_extent.c:122 jfs_get_block+0x428/0xb20 fs/jfs/inode.c:248 __block_write_begin_int+0x3c0/0x1470 fs/buffer.c:2128 __block_write_begin fs/buffer.c:2178 [inline] block_write_begin+0xb1/0x490 fs/buffer.c:2239 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299 generic_perform_write+0x278/0x600 mm/filemap.c:3923 __generic_file_write_iter+0x1d0/0x240 mm/filemap.c:4014 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4044 call_write_iter include/linux/fs.h:1877 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x830 fs/read_write.c:860 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901 iter_file_splice_write+0x698/0xbf0 fs/splice.c:739 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x118/0x180 fs/splice.c:1145 splice_direct_to_actor+0x347/0xa30 fs/splice.c:1091 do_splice_direct+0x1af/0x280 fs/splice.c:1197 do_sendfile+0xb88/0x1390 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7eff5747cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007eff581cc0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007eff5759bf80 RCX: 00007eff5747cae9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000008 RBP: 00007eff574c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0001000000201004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007eff5759bf80 R15: 00007ffef9231dc8 ================================================================================