bisecting fixing commit since 87335852c5d9ec629f80bb2257b9a9945962b719
building syzkaller on e34b696c0d7c04dbc824dee8b5123969bbca19b7
testing commit 87335852c5d9ec629f80bb2257b9a9945962b719 with gcc (GCC) 8.4.1 20210217
kernel signature: 28434601f3854a292263cfa1b60c0e6e3eeb45fe2d14003021da6d1c65dec66e
all runs: crashed: divide error in squashfs_readpage
testing current HEAD 3242aa3a635c0958671ee1e4b0958dcc7c4e5c79
testing commit 3242aa3a635c0958671ee1e4b0958dcc7c4e5c79 with gcc (GCC) 8.4.1 20210217
kernel signature: e896909f82c9136aa144efeb9ef46da6c2e14a49e60558057e8396b650eca889
all runs: crashed: divide error in squashfs_readpage
revisions tested: 2, total time: 22m0.591933913s (build: 14m33.665728453s, test: 6m31.790756844s)
the crash still happens on HEAD
commit msg: Linux 4.14.222
crash: divide error in squashfs_readpage
Bluetooth: hci0 command 0x0419 tx timeout
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
divide error: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 9055 Comm: syz-executor.0 Not tainted 4.14.222-syzkaller #0
device veth1_vlan entered promiscuous mode
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8881ebefa340 task.stack: ffff8881d8ac0000
IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready
RIP: 0010:fill_meta_index fs/squashfs/file.c:256 [inline]
RIP: 0010:read_blocklist fs/squashfs/file.c:345 [inline]
RIP: 0010:squashfs_readpage+0x7f4/0x21c0 fs/squashfs/file.c:482
RSP: 0018:ffff8881d8ac7628 EFLAGS: 00010246
IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000000000
IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881ca7334c8
RBP: ffff8881d8ac7820 R08: ffffea000723d290 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ca7334c0
R13: 00000000000000de R14: 0000000000000099 R15: ffff8881ca7334f8
FS:  00007f571abcb700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000055c071 CR3: 00000001d1ab9006 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 read_pages mm/readahead.c:131 [inline]
 __do_page_cache_readahead+0x679/0x950 mm/readahead.c:199
 ra_submit mm/internal.h:66 [inline]
 ondemand_readahead+0x42b/0xbc0 mm/readahead.c:486
 page_cache_sync_readahead mm/readahead.c:518 [inline]
 page_cache_sync_readahead+0x85/0xf0 mm/readahead.c:503
 generic_file_buffered_read mm/filemap.c:2003 [inline]
 generic_file_read_iter+0xe53/0x1f30 mm/filemap.c:2273
 call_read_iter include/linux/fs.h:1772 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 __vfs_read+0x410/0x840 fs/read_write.c:413
 vfs_read+0xff/0x310 fs/read_write.c:447
 kernel_read+0x90/0x130 fs/read_write.c:426
 prepare_binprm+0x5b5/0x800 fs/exec.c:1581
 do_execveat_common.isra.14+0xd9e/0x1d70 fs/exec.c:1798
IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready
 do_execveat fs/exec.c:1871 [inline]
 SYSC_execveat fs/exec.c:1952 [inline]
 SyS_execveat+0x46/0x60 fs/exec.c:1944
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
device veth0_macvtap entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465889
RSP: 002b:00007f571abcb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00
R13: 00007fff5c3390af R14: 00007f571abcb300 R15: 0000000000022000
Code: 
device veth1_macvtap entered promiscuous mode
49 
IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready
8b 
IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready
47 
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
c8 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
31 d2 48 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
63 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
8d 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
2c 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
fe 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
ff ff 48 89 85 90 fe ff ff 48 63 85 78 fe ff ff 48 89 ce 48 c1 e1 0b c1 e6 0b 89 b5 60 fe ff ff <48> f7 f1 85 c0 48 89 85 68 fe ff ff 89 85 8c fe ff ff 0f 8e c3 
RIP: fill_meta_index fs/squashfs/file.c:256 [inline] RSP: ffff8881d8ac7628
RIP: read_blocklist fs/squashfs/file.c:345 [inline] RSP: ffff8881d8ac7628
RIP: squashfs_readpage+0x7f4/0x21c0 fs/squashfs/file.c:482 RSP: ffff8881d8ac7628
---[ end trace 640ad65abe8de41c ]---