bisecting fixing commit since 13d2ce42de8cb98ff952f8de6307f896203854c2
building syzkaller on 97183ed760478c5b970c8c549d99c8147a72e293
testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.4.1 20210217
kernel signature: f1d189969c6b8357fa0d693f583ee5b07080637ea9690a62624d8265a723d6c8
all runs: crashed: divide error in squashfs_readpage
testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff
testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217
kernel signature: 555b72d78469eb6564962a3a2e9bf0e520668e343080a5dbc5d048da4fb4532c
all runs: crashed: divide error in squashfs_readpage
revisions tested: 2, total time: 22m11.759509086s (build: 15m27.67115537s, test: 6m22.49700298s)
the crash still happens on HEAD
commit msg: Linux 4.19.183
crash: divide error in squashfs_readpage
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
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:3e) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9768 Comm: syz-executor.2 Not tainted 4.19.183-syzkaller #0
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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+0x8b4/0x2330 fs/squashfs/file.c:482
Code: 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 cb 48 c1 e1 0b c1 e3 0b 89 9d 60 fe ff ff <48> f7 f1 85 c0 48 89 85 68 fe ff ff 89 85 8c fe ff ff 0f 8e 22 11
RSP: 0018:ffff88809cfb7578 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff11014b6a777 RDI: ffff8880811684c8
RBP: ffff88809cfb7770 R08: ffffea00020500e0 R09: fffff9400040a01e
R10: fffff9400040a01e R11: ffffea00020500f7 R12: ffff8880811684c0
R13: 00000000000000de R14: 0000000000000099 R15: ffff8880811684f8
FS:  00007fb56ff1c700(0000) GS:ffff8880ba200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005638e8fb8000 CR3: 000000009b292000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 read_pages+0x2b1/0x510 mm/readahead.c:133
 __do_page_cache_readahead+0x353/0x580 mm/readahead.c:211
 ra_submit mm/internal.h:66 [inline]
 ondemand_readahead+0x42b/0xbc0 mm/readahead.c:493
 page_cache_sync_readahead mm/readahead.c:528 [inline]
 page_cache_sync_readahead+0x1d9/0x3c0 mm/readahead.c:510
 generic_file_buffered_read mm/filemap.c:2115 [inline]
 generic_file_read_iter+0xf3d/0x2150 mm/filemap.c:2385
 call_read_iter include/linux/fs.h:1815 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x440/0x880 fs/read_write.c:418
batman_adv: batadv0: Interface activated: batadv_slave_1
 vfs_read+0xff/0x300 fs/read_write.c:452
 kernel_read+0x90/0x130 fs/read_write.c:431
 prepare_binprm+0x5bd/0x810 fs/exec.c:1596
 __do_execve_file.isra.12+0xe52/0x1d30 fs/exec.c:1815
 do_execveat_common fs/exec.c:1879 [inline]
 do_execveat+0x18/0x20 fs/exec.c:1907
 __do_sys_execveat fs/exec.c:1988 [inline]
 __se_sys_execveat fs/exec.c:1980 [inline]
 __x64_sys_execveat+0xe2/0x120 fs/exec.c:1980
ieee80211 phy6: Selected rate control algorithm 'minstrel_ht'
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465a49
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fb56ff1c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 000000000055bf40 RCX: 0000000000465a49
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00000000004af682 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf40
R13: 00007ffc75600f9f R14: 00007fb56ff1c300 R15: 0000000000022000
Modules linked in:
---[ end trace 1c04bba9cb4bf416 ]---
Bluetooth: hci0: command 0x0419 tx timeout
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes 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+0x8b4/0x2330 fs/squashfs/file.c:482
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
Code: 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 cb 48 c1 e1 0b c1 e3 0b 89 9d 60 fe ff ff <48> f7 f1 85 c0 48 89 85 68 fe ff ff 89 85 8c fe ff ff 0f 8e 22 11
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
RSP: 0018:ffff88809cfb7578 EFLAGS: 00010246
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
RDX: 0000000000000000 RSI: 1ffff11014b6a777 RDI: ffff8880811684c8
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RBP: ffff88809cfb7770 R08: ffffea00020500e0 R09: fffff9400040a01e
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
R10: fffff9400040a01e R11: ffffea00020500f7 R12: ffff8880811684c0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Bluetooth: hci2: command 0x0419 tx timeout
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
R13: 00000000000000de R14: 0000000000000099 R15: ffff8880811684f8
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Bluetooth: hci1: command 0x0419 tx timeout
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
FS:  00007fb56ff1c700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
batman_adv: batadv0: Interface activated: batadv_slave_1
Bluetooth: hci3: command 0x0419 tx timeout
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
CR2: 00007fe4f5ac2000 CR3: 000000009b292000 CR4: 00000000001406e0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Bluetooth: hci5: command 0x0419 tx timeout
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1