bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217 building syzkaller on 638690213ad14c862fe8eca5c0629eaca46749f8 testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.1.0 kernel signature: dbc17c2695cd47db8ad71114e6efec6ce146d0be316045a1bbd152b8bb88f061 all runs: crashed: BUG: unable to handle kernel paging request in diFree testing current HEAD 0c88e405c97ed1828443b67891e6d4bb6e56cd4e testing commit 0c88e405c97ed1828443b67891e6d4bb6e56cd4e with gcc (GCC) 8.1.0 kernel signature: b90c447a7ff03f4c417b8398695b50e73ccc2d2b226fe7df1fb04b326158ba9e all runs: crashed: BUG: unable to handle kernel paging request in diFree revisions tested: 2, total time: 25m11.658184711s (build: 18m35.585166614s, test: 5m43.202342328s) the crash still happens on HEAD commit msg: Linux 4.19.160 crash: BUG: unable to handle kernel paging request in diFree IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready BUG: unable to handle kernel paging request at ffffffffffffff80 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready PGD 8670067 P4D 8670067 PUD 8672067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8345 Comm: syz-executor.1 Not tainted 4.19.160-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:ffff88809a737790 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88809c2584c0 RCX: 0000000000000000 RDX: 1ffffffffffffff0 RSI: 0000000000000000 RDI: ffffffffffffff80 RBP: ffff88809a737a40 R08: ffffed101027be9f R09: ffffed101027be9e R10: ffffed101027be9e R11: ffff8880813df4f3 R12: ffff88809fbe7300 R13: ffff8880813df538 R14: ffff88809a737a18 R15: ffff8880813df468 FS: 00007f77aa72f700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffff80 CR3: 00000000a1061000 CR4: 00000000001406f0 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:559 iput_final fs/inode.c:1555 [inline] iput+0x378/0x6b0 fs/inode.c:1581 diFreeSpecial+0x5d/0x80 fs/jfs/jfs_imap.c:563 jfs_mount+0x1da/0x340 fs/jfs/jfs_mount.c:222 jfs_fill_super+0x52c/0xb10 fs/jfs/super.c:589 mount_bdev+0x26f/0x330 fs/super.c:1158 jfs_do_mount+0x10/0x20 fs/jfs/super.c:703 mount_fs+0x7f/0x2a2 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 ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ksys_mount+0xba/0xe0 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: 0033:0x4608aa Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f77aa72ea88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f77aa72eb20 RCX: 00000000004608aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f77aa72eae0 RBP: 00007f77aa72eae0 R08: 00007f77aa72eb20 R09: 0000000020000000 R10: 0000000000008001 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020064f00 Modules linked in: CR2: ffffffffffffff80 ---[ end trace a5ec449953adb34c ]--- BUG: unable to handle kernel paging request at ffffffffffffff80 RIP: 0010:diFree+0x192/0x32f0 fs/jfs/jfs_imap.c:866 PGD 8670067 P4D 8670067 PUD 8672067 PMD 0 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 Oops: 0000 [#2] PREEMPT SMP KASAN RSP: 0018:ffff88809a737790 EFLAGS: 00010246 CPU: 1 PID: 8364 Comm: syz-executor.0 Tainted: G D 4.19.160-syzkaller #0 RAX: 0000000000000000 RBX: ffff88809c2584c0 RCX: 0000000000000000 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RDX: 1ffffffffffffff0 RSI: 0000000000000000 RDI: ffffffffffffff80 RIP: 0010:diFree+0x192/0x32f0 fs/jfs/jfs_imap.c:866 RBP: ffff88809a737a40 R08: ffffed101027be9f R09: ffffed101027be9e 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 R10: ffffed101027be9e R11: ffff8880813df4f3 R12: ffff88809fbe7300 RSP: 0018:ffff8880991df790 EFLAGS: 00010246 R13: ffff8880813df538 R14: ffff88809a737a18 R15: ffff8880813df468 FS: 00007f77aa72f700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 RAX: 0000000000000000 RBX: ffff88809d0d8e00 RCX: 0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffff80 CR3: 00000000a1061000 CR4: 00000000001406f0 RDX: 1ffffffffffffff0 RSI: 0000000000000000 RDI: ffffffffffffff80 RBP: ffff8880991dfa40 R08: ffffed10102770af R09: ffffed10102770ae DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 R10: ffffed10102770ae R11: ffff8880813b8573 R12: ffff88809bde9b40 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 R13: ffff8880813b85b8 R14: ffff8880991dfa18 R15: ffff8880813b84e8