bisecting fixing commit since 87335852c5d9ec629f80bb2257b9a9945962b719
building syzkaller on e34b696c0d7c04dbc824dee8b5123969bbca19b7
testing commit 87335852c5d9ec629f80bb2257b9a9945962b719 with gcc (GCC) 8.1.0
kernel signature: a73429b7cda391bfc0f50d0ff87721c4d753b08acd858f17fed3bda66ba67bde
all runs: crashed: divide error in squashfs_readpage
testing current HEAD 3f2ecb86cb909da0b9157fd2952ad79924cbe5ae
testing commit 3f2ecb86cb909da0b9157fd2952ad79924cbe5ae with gcc (GCC) 8.1.0
kernel signature: ce0876561860a06eafbe8c53e9bb2ad9864e3142f98c9ce31dfb9c61a83af83d
all runs: crashed: divide error in squashfs_readpage
revisions tested: 2, total time: 22m49.085369124s (build: 16m36.817075019s, test: 5m31.343037999s)
the crash still happens on HEAD
commit msg: Linux 4.14.212
crash: divide error in squashfs_readpage
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
divide error: 0000 [#1] PREEMPT SMP KASAN
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Modules linked in:
CPU: 1 PID: 9135 Comm: syz-executor.2 Not tainted 4.14.212-syzkaller #0
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
task: ffff8881e707c6c0 task.stack: ffff8881d0d08000
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+0x7f4/0x21be fs/squashfs/file.c:482
RSP: 0018:ffff8881d0d0f638 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881ca3f34c8
RBP: ffff8881d0d0f830 R08: ffffea00071d1190 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ca3f34c0
R13: 00000000000000de R14: 0000000000000099 R15: ffff8881ca3f34f8
FS:  00007f264be48700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004e1250 CR3: 00000001e74a7006 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
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
 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+0x85/0xf0 mm/readahead.c:518
 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+0xf9/0x300 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
 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: 0033:0x45deb9
RSP: 002b:00007f264be47c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 0000000000002dc0 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 000000000118bf70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd6bec9fff R14: 00007f264be489c0 R15: 000000000118bf2c
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 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: ffff8881d0d0f638
RIP: read_blocklist fs/squashfs/file.c:345 [inline] RSP: ffff8881d0d0f638
RIP: squashfs_readpage+0x7f4/0x21be fs/squashfs/file.c:482 RSP: ffff8881d0d0f638
---[ end trace a9cc0f6b2e128cd8 ]---
batman_adv: batadv0: Interface activated: batadv_slave_0