bisecting fixing commit since 87335852c5d9ec629f80bb2257b9a9945962b719
building syzkaller on e34b696c0d7c04dbc824dee8b5123969bbca19b7
testing commit 87335852c5d9ec629f80bb2257b9a9945962b719 with gcc (GCC) 8.4.1 20210217
kernel signature: cbf02d63bd305e5d8ac0a8f6201a80a887b2da350ea26ba8743e9ffd0228fd76
all runs: crashed: divide error in squashfs_readpage
testing current HEAD cf256fbcbe347b7d0ff58fe2dfa382a156bd3694
testing commit cf256fbcbe347b7d0ff58fe2dfa382a156bd3694 with gcc (GCC) 8.4.1 20210217
kernel signature: d5f877a11afb2e6a3c3e7321e1820e1bcca0fae32c79e1744bfe70af635c9ee6
all runs: crashed: divide error in squashfs_readpage
revisions tested: 2, total time: 26m52.70651938s (build: 19m55.310815901s, test: 6m27.168425023s)
the crash still happens on HEAD
commit msg: Linux 4.14.231
crash: divide error in squashfs_readpage
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready
divide error: 0000 [#1] PREEMPT SMP KASAN
IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready
Modules linked in:
CPU: 1 PID: 9029 Comm: syz-executor.3 Not tainted 4.14.231-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8881ecae4080 task.stack: ffff8881cc010000
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:ffff8881cc017628 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881c7b224c8
RBP: ffff8881cc017820 R08: ffffea000725b510 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881c7b224c0
R13: 00000000000000de R14: 0000000000000099 R15: ffff8881c7b224f8
FS:  00007f9767759700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d694fc660 CR3: 00000001f2021003 CR4: 00000000001606e0
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
device veth0_macvtap entered promiscuous mode
 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
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465889
RSP: 002b:00007f9767759188 EFLAGS: 00000246
IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready
 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: 00007fff0869264f R14: 00007f9767759300 R15: 0000000000022000
Code: 49 8b 47 c8 31 d2 48 63 8d 2c fe ff ff 48 89 85 90 fe ff ff 48 63 85 78 fe ff ff 48 89 ce 48 c1 
ieee80211 phy7: Selected rate control algorithm 'minstrel_ht'
e1 
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
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: ffff8881cc017628
RIP: read_blocklist fs/squashfs/file.c:345 [inline] RSP: ffff8881cc017628
RIP: squashfs_readpage+0x7f4/0x21c0 fs/squashfs/file.c:482 RSP: ffff8881cc017628
---[ end trace 6623b42a64add7bf ]---
ieee80211 phy7: hwaddr 02:00:00:00:07:00 registered