bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217 building syzkaller on d32b0bbf2f8cfe548553c4012e2c0f79040d999f testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.4.1 20210217 kernel signature: 4b7bc619dac74b8078ba6041b0e4f9137f0621d6a56634ec860a9ccc9a36295e run #0: crashed: general protection fault in diFree run #1: crashed: general protection fault in diFree run #2: crashed: KASAN: use-after-free Read in diFree run #3: crashed: KASAN: use-after-free Read in diFree run #4: crashed: general protection fault in diFree run #5: crashed: general protection fault in diFree run #6: crashed: general protection fault in diFree run #7: crashed: KASAN: use-after-free Read in diFree run #8: crashed: KASAN: use-after-free Read in diFree run #9: crashed: general protection fault in diFree run #10: crashed: general protection fault in diFree run #11: crashed: general protection fault in diFree run #12: crashed: KASAN: use-after-free Read in diFree run #13: crashed: KASAN: use-after-free Read in diFree run #14: crashed: general protection fault in corrupted run #15: crashed: general protection fault in diFree run #16: crashed: KASAN: use-after-free Read in diFree run #17: crashed: KASAN: use-after-free Read in diFree run #18: crashed: KASAN: use-after-free Read in diFree run #19: crashed: KASAN: use-after-free Read in diFree testing current HEAD eb575cd5d7f60241d016fdd13a9e86d962093c9b testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b with gcc (GCC) 8.4.1 20210217 kernel signature: 95c415e4756449646cdb11a348013d84365f01d4f761333e7bde2ea8a4ffa269 run #0: crashed: general protection fault in diFree run #1: crashed: general protection fault in diFree run #2: crashed: general protection fault in diFree run #3: crashed: general protection fault in diFree run #4: crashed: KASAN: use-after-free Read in diFree run #5: crashed: general protection fault in diFree run #6: crashed: KASAN: use-after-free Read in diFree run #7: crashed: KASAN: use-after-free Read in diFree run #8: crashed: general protection fault in diFree run #9: crashed: KASAN: use-after-free Read in diFree revisions tested: 2, total time: 30m54.413748991s (build: 22m48.143427123s, test: 7m41.665411669s) the crash still happens on HEAD commit msg: Linux 4.19.195 crash: KASAN: use-after-free Read in diFree ERROR: (device loop0): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop3): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop1): xtSearch: XT_GETPAGE: xtree page corrupt ================================================================== BUG: KASAN: use-after-free in diFree+0x1581/0x32f0 fs/jfs/jfs_imap.c:886 Read of size 4 at addr ffff8881d8185cc4 by task syz-executor.0/8250 CPU: 1 PID: 8250 Comm: syz-executor.0 Not tainted 4.19.195-syzkaller #0 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 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 diFree+0x1581/0x32f0 fs/jfs/jfs_imap.c:886 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 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_umount+0xce/0x300 fs/jfs/jfs_umount.c:78 jfs_fill_super+0x625/0xb10 fs/jfs/super.c:633 mount_bdev+0x26f/0x330 fs/super.c:1158 jfs_do_mount+0x10/0x20 fs/jfs/super.c:703 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: 0033:0x466d6a 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:00007fc55f26afa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466d6a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc55f26b000 RBP: 00007fc55f26b040 R08: 00007fc55f26b040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fc55f26b000 R15: 000000002006d200 Allocated by task 8250: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 kmem_cache_alloc_trace+0x152/0x3a0 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] diMount+0x4d/0x690 fs/jfs/jfs_imap.c:118 jfs_mount+0x27f/0x340 fs/jfs/jfs_mount.c:191 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/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 Freed by task 8250: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 diUnmount+0xdb/0x120 fs/jfs/jfs_imap.c:210 jfs_umount+0xc6/0x300 fs/jfs/jfs_umount.c:76 jfs_fill_super+0x625/0xb10 fs/jfs/super.c:633 mount_bdev+0x26f/0x330 fs/super.c:1158 jfs_do_mount+0x10/0x20 fs/jfs/super.c:703 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 The buggy address belongs to the object at ffff8881d8185cc0 which belongs to the cache kmalloc-32768 of size 32768 The buggy address is located 4 bytes inside of 32768-byte region [ffff8881d8185cc0, ffff8881d818dcc0) The buggy address belongs to the page: page:ffffea0007606000 count:1 mapcount:0 mapping:ffff8881f6002380 index:0x0 compound_mapcount: 0 flags: 0x17ffe0000008100(slab|head) raw: 017ffe0000008100 ffffea00075eac08 ffff8881f6001d48 ffff8881f6002380 raw: 0000000000000000 ffff8881d8185cc0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d8185b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d8185c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881d8185c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8881d8185d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d8185d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== imap: 000000004a1d2c83: d4121080 ffff8881 00000000 00000000 imap: 00000000a5d88687: 00000000 00000000 00000000 00000000 ERROR: (device loop0): diFree: inum = 16, iagno = 0, nextiag = -30591 ERROR: (device loop2): xtSearch: XT_GETPAGE: xtree page corrupt ERROR: (device loop3): xtSearch: XT_GETPAGE: xtree page corrupt imap: 000000004f5a916a: 00000000 00000000 00000000 00000000 imap: 000000004c6283d3: 00000000 00000000 00000000 00000000 ERROR: (device loop1): diFree: inum = 16, iagno = 0, nextiag = -30591 ERROR: (device loop5): xtSearch: XT_GETPAGE: xtree page corrupt kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8271 Comm: syz-executor.5 Tainted: G B 4.19.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:diFree+0x1bd/0x32f0 fs/jfs/jfs_imap.c:886 Code: 8b 68 80 48 8b 85 28 fe ff ff 49 8d 5d 04 48 c1 e8 0c 48 89 da 48 c1 ea 03 48 89 85 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a3 RSP: 0018:ffff8881d527f790 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881c743d3a8 RBP: ffff8881d527fa40 R08: ffffed1038e87a97 R09: ffffed1038e87a96 R10: ffffed1038e87a96 R11: ffff8881c743d4b3 R12: ffff8881f4739e40 R13: 0000000000000000 R14: ffff8881d527fa18 R15: ffff8881c743d428 FS: 00007fbfcfda7700(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4a7b562000 CR3: 00000001d8b13004 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: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+0x295/0x340 fs/jfs/jfs_mount.c:202 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/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: 0033:0x466d6a 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:00007fbfcfda6fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466d6a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fbfcfda7000 RBP: 00007fbfcfda7040 R08: 00007fbfcfda7040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fbfcfda7000 R15: 000000002006d200 Modules linked in: ---[ end trace 66b121e20fc3d2bb ]--- RIP: 0010:diFree+0x1bd/0x32f0 fs/jfs/jfs_imap.c:886 Code: 8b 68 80 48 8b 85 28 fe ff ff 49 8d 5d 04 48 c1 e8 0c 48 89 da 48 c1 ea 03 48 89 85 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a3 RSP: 0018:ffff8881d527f790 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881c743d3a8 RBP: ffff8881d527fa40 R08: ffffed1038e87a97 R09: ffffed1038e87a96 imap: 000000000e2a1d16: 00000000 00000000 00000000 00000000 imap: 00000000e3221bca: 00000000 00000000 00000000 00000000 R10: ffffed1038e87a96 R11: ffff8881c743d4b3 R12: ffff8881f4739e40 ERROR: (device loop4): diFree: inum = 16, iagno = 0, nextiag = -30591 R13: 0000000000000000 R14: ffff8881d527fa18 R15: ffff8881c743d428 FS: 00007fbfcfda7700(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf5673b000 CR3: 00000001d8b13006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400