bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217
building syzkaller on 638690213ad14c862fe8eca5c0629eaca46749f8
testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.4.1 20210217
kernel signature: ebd51a9f9e6bcfa822178766758b7a9e416e4e0d250af62867f07f4621e87602
all runs: crashed: BUG: unable to handle kernel paging request in diFree
testing current HEAD eb575cd5d7f60241d016fdd13a9e86d962093c9b
testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b with gcc (GCC) 8.4.1 20210217
kernel signature: 3c25ae8ab1e6b71657b04fe5290306c283ec4054ce5690c5cddddd617d8b943b
all runs: crashed: BUG: unable to handle kernel paging request in diFree
revisions tested: 2, total time: 32m40.747743826s (build: 25m2.926965225s, test: 6m55.299822149s)
the crash still happens on HEAD
commit msg: Linux 4.19.195
crash: BUG: unable to handle kernel paging request in diFree
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
ERROR: (device loop1): xtSearch: XT_GETPAGE: xtree page corrupt
BUG: unable to handle kernel paging request at ffffffffffffff80
PGD 8670067 P4D 8670067 PUD 8672067 PMD 0 
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7603 Comm: syz-executor.1 Not tainted 4.19.195-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:diFree+0x192/0x32f0 fs/jfs/jfs_imap.c:866
Code: 00 48 89 85 00 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 20 20 00 00 48 8b 85 18 fe ff ff <4c> 8b 68 80 48 8b 85 28 fe ff ff 49 8d 5d 04 48 c1 e8 0c 48 89 da
RSP: 0018:ffff8881d7cb7790 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881cda36100 RCX: 0000000000000000
RDX: 1ffffffffffffff0 RSI: 0000000000000000 RDI: ffffffffffffff80
RBP: ffff8881d7cb7a40 R08: ffffed10393e3a9f R09: ffffed10393e3a9e
R10: ffffed10393e3a9e R11: ffff8881c9f1d4f3 R12: ffff8881d48d5140
R13: ffff8881c9f1d538 R14: ffff8881d7cb7a18 R15: ffff8881c9f1d468
FS:  00007f868ec62700(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff80 CR3: 00000001d5256005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ieee80211 phy10: Selected rate control algorithm 'minstrel_ht'
 jfs_evict_inode+0xd1/0x110 fs/jfs/inode.c:164
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
 evict+0x29c/0x590 fs/inode.c:559
 iput_final fs/inode.c:1555 [inline]
 iput fs/inode.c:1581 [inline]
 iput+0x378/0x6b0 fs/inode.c:1567
 diFreeSpecial fs/jfs/jfs_imap.c:563 [inline]
 diFreeSpecial+0x5d/0x80 fs/jfs/jfs_imap.c:555
 jfs_mount+0x1da/0x340 fs/jfs/jfs_mount.c:223
 jfs_fill_super+0x52c/0xb10 fs/jfs/super.c:589
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
 mount_bdev+0x26f/0x330 fs/super.c:1158
ieee80211 phy11: Selected rate control algorithm 'minstrel_ht'
 jfs_do_mount+0x10/0x20 fs/jfs/super.c:703
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
 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
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
 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: 0033:0x466d6a
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:00007f868ec61fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466d6a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f868ec62000
RBP: 00007f868ec62040 R08: 00007f868ec62040 R09: 0000000020000000
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
R10: 0000000000008001 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f868ec62000 R15: 0000000020064f00
Modules linked in:
CR2: ffffffffffffff80
---[ end trace 12f1eaace12e12ed ]---
RIP: 0010:diFree+0x192/0x32f0 fs/jfs/jfs_imap.c:866
Code: 00 48 89 85 00 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 20 20 00 00 48 8b 85 18 fe ff ff <4c> 8b 68 80 48 8b 85 28 fe ff ff 49 8d 5d 04 48 c1 e8 0c 48 89 da
RSP: 0018:ffff8881d7cb7790 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881cda36100 RCX: 0000000000000000
RDX: 1ffffffffffffff0 RSI: 0000000000000000 RDI: ffffffffffffff80
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
RBP: ffff8881d7cb7a40 R08: ffffed10393e3a9f R09: ffffed10393e3a9e
R10: ffffed10393e3a9e R11: ffff8881c9f1d4f3 R12: ffff8881d48d5140
R13: ffff8881c9f1d538 R14: ffff8881d7cb7a18 R15: ffff8881c9f1d468
FS:  00007f868ec62700(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff80 CR3: 00000001d5256005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400