loop4: detected capacity change from 0 to 4 BUG: spinlock bad magic on CPU#1, syz-executor.4/1754 lock: 0xffff8880b9c31d60, .magic: 00000000, .owner: /-1, .owner_cpu: 0 CPU: 1 PID: 1754 Comm: syz-executor.4 Not tainted 5.12.0-rc6-next-20210408-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+0x141/0x1d7 lib/dump_stack.c:120 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x216/0x2b0 kernel/locking/spinlock_debug.c:112 erofs_pcpubuf_growsize+0x36f/0x620 fs/erofs/pcpubuf.c:83 z_erofs_load_lz4_config+0x1ef/0x3e0 fs/erofs/decompressor.c:64 erofs_read_superblock fs/erofs/super.c:331 [inline] erofs_fc_fill_super+0xe84/0x1d10 fs/erofs/super.c:499 get_tree_bdev+0x440/0x760 fs/super.c:1293 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46797a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f50d6595fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020001640 RCX: 000000000046797a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f50d6596000 RBP: 00007f50d6596040 R08: 00007f50d6596040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f50d6596000 R15: 0000000020000200 erofs: (device loop4): erofs_fc_fill_super: rootino(nid 36) is not a directory(i_mode 107533) loop4: detected capacity change from 0 to 4 erofs: (device loop4): erofs_fc_fill_super: rootino(nid 36) is not a directory(i_mode 107533)