bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072 building syzkaller on 624dad51316f9973e1349b6c71e789737d1e00d9 testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5dd3145b8e8652e7c5f8e8d122384efa544586a49d2db6d3745294588745fe9f run #0: crashed: kernel BUG in corrupted run #1: crashed: kernel BUG in iput run #2: crashed: kernel BUG in iput run #3: crashed: kernel BUG in iput run #4: crashed: kernel BUG in iput run #5: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop0] run #6: crashed: kernel BUG in iput run #7: crashed: kernel BUG in iput run #8: crashed: kernel BUG in corrupted run #9: crashed: kernel BUG in corrupted run #10: crashed: kernel BUG in iput run #11: crashed: kernel BUG in iput run #12: crashed: kernel BUG in iput run #13: crashed: kernel BUG in iput run #14: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop1] run #15: crashed: kernel BUG in iput run #16: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop4] run #17: crashed: kernel BUG in corrupted run #18: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop2] run #19: crashed: kernel BUG in iput testing current HEAD 4938296e03bd227e5020d63d418956fe52baf97c testing commit 4938296e03bd227e5020d63d418956fe52baf97c compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 354f967eaa0ced09c6959d0e0b85638288c2c58075cf8587afcc9072f0332122 run #0: crashed: kernel BUG in iput run #1: crashed: kernel BUG in iput run #2: crashed: kernel BUG in iput run #3: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop3] run #4: crashed: kernel BUG in corrupted run #5: crashed: kernel BUG in iput run #6: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop2] run #7: crashed: kernel BUG in iput run #8: crashed: BUG: Dentry ADDR{i=0,n=/} still in use (-128) [unmount of erofs loop3] run #9: crashed: kernel BUG in corrupted revisions tested: 2, total time: 23m6.500742065s (build: 16m5.26427248s, test: 6m36.498381565s) the crash still happens on HEAD commit msg: Linux 4.19.198 crash: kernel BUG in corrupted R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f52e0d47000 R15: 0000000020000140 CPU: 1 PID: 10055 Comm: syz-executor.5 Not tainted 4.19.198-syzkaller #0 ------------[ cut here ]------------ Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kernel BUG at fs/inode.c:1571! Call Trace: invalid opcode: 0000 [#1] PREEMPT SMP KASAN __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 CPU: 0 PID: 10054 Comm: syz-executor.4 Not tainted 4.19.198-syzkaller #0 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:iput+0x536/0x6b0 fs/inode.c:1571 Code: 48 b8 00 00 00 00 00 fc ff df 48 8b 55 c8 48 c1 ea 03 80 3c 02 00 0f 84 ac fd ff ff 48 8b 7d c8 e8 7f ac f0 ff e9 9e fd ff ff <0f> 0b 48 89 df e8 60 f9 ff ff 48 8b 7d d0 e8 47 ff 09 06 e9 2a fe RSP: 0018:ffff88807fb87a18 EFLAGS: 00010202 should_fail_alloc_page mm/page_alloc.c:3088 [inline] prepare_alloc_pages mm/page_alloc.c:4346 [inline] __alloc_pages_nodemask+0x23c/0x25a0 mm/page_alloc.c:4393 RAX: dffffc0000000000 RBX: ffff88808b842640 RCX: 1ffff11015e5459d RDX: 1ffff110117084e2 RSI: ffff8880af2a2cc8 RDI: ffff88808b842640 RBP: ffff88807fb87a60 R08: ffff8880af2a2ce8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808b842640 R13: ffff88807f4420c0 R14: 0000000000000000 R15: ffff88807f442128 FS: 00007f52e0d47700(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000003367708 CR3: 00000000933ce000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 __alloc_pages include/linux/gfp.h:496 [inline] __alloc_pages_node include/linux/gfp.h:509 [inline] kmem_getpages mm/slab.c:1412 [inline] cache_grow_begin+0xa5/0x8b0 mm/slab.c:2682 Call Trace: cache_alloc_refill+0x2ac/0x380 mm/slab.c:3049 erofs_read_super drivers/staging/erofs/super.c:439 [inline] erofs_fill_super+0x10b4/0x1168 drivers/staging/erofs/super.c:499 ____cache_alloc mm/slab.c:3132 [inline] __do_cache_alloc mm/slab.c:3354 [inline] slab_alloc mm/slab.c:3389 [inline] kmem_cache_alloc+0x361/0x390 mm/slab.c:3557 alloc_inode+0x16/0x40 drivers/staging/erofs/super.c:49 alloc_inode+0x56/0x150 fs/inode.c:211 mount_bdev+0x26f/0x330 fs/super.c:1158 iget_locked+0x147/0x3f0 fs/inode.c:1176 erofs_iget+0x1c/0x2280 drivers/staging/erofs/inode.c:295 erofs_mount+0x6a/0x90 drivers/staging/erofs/super.c:512 erofs_read_super drivers/staging/erofs/super.c:394 [inline] erofs_fill_super+0xe6c/0x1168 drivers/staging/erofs/super.c:499 mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x376/0x2710 fs/namespace.c:2799 mount_bdev+0x26f/0x330 fs/super.c:1158 erofs_mount+0x6a/0x90 drivers/staging/erofs/super.c:512 ksys_mount+0xb1/0xd0 fs/namespace.c:3015 mount_fs+0x7f/0x2b0 fs/super.c:1261 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x376/0x2710 fs/namespace.c:2799 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46702a 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:00007f52e0d46fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046702a ksys_mount+0xb1/0xd0 fs/namespace.c:3015 RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f52e0d47000 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 RBP: 00007f52e0d47040 R08: 00007f52e0d47040 R09: 0000000020000000 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 entry_SYSCALL_64_after_hwframe+0x49/0xbe R13: 0000000020000100 R14: 00007f52e0d47000 R15: 0000000020000140 RIP: 0033:0x46702a Modules linked in: 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 ---[ end trace bb4d8aa99d80a209 ]--- RSP: 002b:00007ff4b3b7cfa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046702a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ff4b3b7d000 RBP: 00007ff4b3b7d040 R08: 00007ff4b3b7d040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007ff4b3b7d000 R15: 0000000020000140 erofs: mounted on /dev/loop5 with opts: acl. CPU: 0 PID: 10045 Comm: syz-executor.3 Tainted: G D 4.19.198-syzkaller #0 RIP: 0010:iput+0x536/0x6b0 fs/inode.c:1571 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+0x17c/0x226 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.2+0x5/0xa lib/fault-inject.c:149 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x20 mm/slab_common.c:1588 Code: 48 b8 00 00 00 00 00 fc ff df 48 8b 55 c8 48 c1 ea 03 80 3c 02 00 0f 84 ac fd ff ff 48 8b 7d c8 e8 7f ac f0 ff e9 9e fd ff ff <0f> 0b 48 89 df e8 60 f9 ff ff 48 8b 7d d0 e8 47 ff 09 06 e9 2a fe slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x28e/0x390 mm/slab.c:3557 RSP: 0018:ffff88807fb87a18 EFLAGS: 00010202 alloc_inode+0x16/0x40 drivers/staging/erofs/super.c:49 RAX: dffffc0000000000 RBX: ffff88808b842640 RCX: 1ffff11015e5459d alloc_inode+0x56/0x150 fs/inode.c:211 iget_locked+0x147/0x3f0 fs/inode.c:1176 erofs_iget+0x1c/0x2280 drivers/staging/erofs/inode.c:295 erofs_read_super drivers/staging/erofs/super.c:394 [inline] erofs_fill_super+0xe6c/0x1168 drivers/staging/erofs/super.c:499 RDX: 1ffff110117084e2 RSI: ffff8880af2a2cc8 RDI: ffff88808b842640 mount_bdev+0x26f/0x330 fs/super.c:1158 RBP: ffff88807fb87a60 R08: ffff8880af2a2ce8 R09: 0000000000000000 erofs_mount+0x6a/0x90 drivers/staging/erofs/super.c:512 mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x376/0x2710 fs/namespace.c:2799 ksys_mount+0xb1/0xd0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46702a 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:00007ff16b398fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046702a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ff16b399000 RBP: 00007ff16b399040 R08: 00007ff16b399040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007ff16b399000 R15: 0000000020000140 erofs: read_super, device -> /dev/loop2 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808b842640 erofs: unmounted for /dev/loop5 R13: ffff88807f4420c0 R14: 0000000000000000 R15: ffff88807f442128 erofs: options -> acl,user_xattr, FS: 00007f52e0d47700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 erofs: unmounted for /dev/loop0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f105d3f4000 CR3: 00000000933ce000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400