bisecting fixing commit since cbfa1702aaf69b2311ea1b35e04f113c48368c67
building syzkaller on 062c9832a6cdb39bf38ad7a6dad51300a2e9a734
testing commit cbfa1702aaf69b2311ea1b35e04f113c48368c67 with gcc (GCC) 8.4.1 20210217
kernel signature: e0bbc2e3f048c0693de29681c2b26b50a84f8a5e120a86fa75c7f15cc8f37a61
run #0: crashed: BUG: unable to handle kernel paging request in diFree
run #1: crashed: BUG: unable to handle kernel paging request in diFree
run #2: crashed: BUG: unable to handle kernel paging request in diFree
run #3: crashed: BUG: unable to handle kernel paging request in diFree
run #4: crashed: BUG: unable to handle kernel paging request in diFree
run #5: crashed: BUG: unable to handle kernel paging request in diFree
run #6: crashed: BUG: unable to handle kernel paging request in diFree
run #7: crashed: BUG: unable to handle kernel
run #8: crashed: BUG: unable to handle kernel paging request in diFree
run #9: crashed: BUG: unable to handle kernel paging request in diFree
run #10: crashed: BUG: unable to handle kernel paging request in diFree
run #11: crashed: BUG: unable to handle kernel paging request in diFree
run #12: crashed: BUG: unable to handle kernel paging request in diFree
run #13: crashed: BUG: unable to handle kernel paging request in diFree
run #14: crashed: BUG: unable to handle kernel paging request in diFree
run #15: crashed: BUG: unable to handle kernel paging request in diFree
run #16: crashed: BUG: unable to handle kernel paging request in diFree
run #17: crashed: BUG: unable to handle kernel paging request in diFree
run #18: crashed: BUG: unable to handle kernel paging request in diFree
run #19: crashed: BUG: unable to handle kernel paging request in diFree
testing current HEAD cf256fbcbe347b7d0ff58fe2dfa382a156bd3694
testing commit cf256fbcbe347b7d0ff58fe2dfa382a156bd3694 with gcc (GCC) 8.4.1 20210217
kernel signature: 6738487777b11ba8628a1621b9be0f228f7cf7362a8af9e80a8fa93f157a0df1
all runs: crashed: BUG: unable to handle kernel paging request in diFree
revisions tested: 2, total time: 21m41.308799924s (build: 15m1.962438767s, test: 6m17.669386524s)
the crash still happens on HEAD
commit msg: Linux 4.14.231
crash: BUG: unable to handle kernel paging request in diFree
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_0
ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
BUG: unable to handle kernel paging request at ffffffffffffff80
ieee80211 phy5: hwaddr 02:00:00:00:05:00 registered
IP: diFree+0x18a/0x32a0 fs/jfs/jfs_imap.c:872
PGD 7e6d067 P4D 7e6d067 PUD 7e6f067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7209 Comm: syz-executor.0 Not tainted 4.14.231-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8881d50ba500 task.stack: ffff8881d5890000
RIP: 0010:diFree+0x18a/0x32a0 fs/jfs/jfs_imap.c:872
RSP: 0018:ffff8881d58977a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881dbe02b40 RCX: 1ffff110393e16ed
RDX: 1ffffffffffffff0 RSI: 0000000000000000 RDI: ffffffffffffff80
RBP: ffff8881d5897a50 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000028 R11: ffff8881d50ba500 R12: ffff8881d9f426c0
R13: ffff8881c9f0b540 R14: ffff8881d5897a28 R15: ffff8881c9f0b468
FS:  00007f89f0eea700(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff80 CR3: 00000001d0bee003 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 jfs_evict_inode+0xd1/0x110 fs/jfs/inode.c:164
 evict+0x29c/0x590 fs/inode.c:555
 iput_final fs/inode.c:1524 [inline]
 iput fs/inode.c:1551 [inline]
 iput+0x3ac/0x810 fs/inode.c:1536
 diFreeSpecial fs/jfs/jfs_imap.c:569 [inline]
 diFreeSpecial+0x5d/0x80 fs/jfs/jfs_imap.c:561
 jfs_mount+0x1da/0x340 fs/jfs/jfs_mount.c:223
 jfs_fill_super+0x524/0xaf0 fs/jfs/super.c:589
 mount_bdev+0x26f/0x330 fs/super.c:1134
 jfs_do_mount+0x10/0x20 fs/jfs/super.c:703
 mount_fs+0x7f/0x270 fs/super.c:1237
 vfs_kern_mount.part.9+0x58/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x352/0x2af0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xb1/0xd0 fs/namespace.c:3072
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466baa
RSP: 002b:00007f89f0ee9fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466baa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f89f0eea000
RBP: 00007f89f0eea040 R08: 00007f89f0eea040 R09: 0000000020000000
R10: 0000000000008001 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f89f0eea000 R15: 0000000020064f00
Code: 00 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 a3 1f 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 
RIP: diFree+0x18a/0x32a0 fs/jfs/jfs_imap.c:872 RSP: ffff8881d58977a0
CR2: ffffffffffffff80
---[ end trace 2b813acc69d1c1c1 ]---