ci2 starts bisection 2026-10-30 16:41:54.03955028 +0000 UTC m=+109.415652648
bisecting fixing commit since 4a079a5d30ebb7570d1eaf238b691ac3ba29680d
building syzkaller on cc0956393c53a7771406d126236893fae27c3e27
ensuring issue is reproducible on original commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d

testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 7a55d450520a3b9488d5f5e9a04e65232f24a7433250ae3b5852ab473f875721
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
check whether we can drop unnecessary instrumentation
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 0adc8284d1e8331c5bf4d35594590c6fcef27bd418ce5297f1d16c101824afe4
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
the bug reproduces without the instrumentation
disabling configs for [memleak ubsan kasan locking atomic_sleep hang], they are not needed
kconfig minimization: base=4788 full=6024 leaves diff=248
split chunks (needed=false): <248>
split chunk #0 of len 248 into 5 parts
testing without sub-chunk 1/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 081004918d4bec4f9c73826a754841ad71c50767c66e49b24e31f57a81ff40c3
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: a3895d5ed3e159783a0fd0f880267fb2ddcb05937e606f908a2f9be9d1b1adf7
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [memleak ubsan kasan locking atomic_sleep hang], they are not needed
testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 1706704ff1770658ed45c950e0d945b3f1dbb0e2a42c5fa591d3ecc49c6b212b
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 8c8848c5ad084ef7f87f0686905c419b67265b430bb77556ca80256c8e7fef67
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 4a079a5d30ebb7570d1eaf238b691ac3ba29680d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
failed building 4a079a5d30ebb7570d1eaf238b691ac3ba29680d: net/socket.c:1128:(.text+0x837): undefined reference to `wext_handle_ioctl'
net/socket.c:3397:(.text+0xa28): undefined reference to `compat_wext_handle_ioctl'
net/core/net-procfs.c:346:(.text+0x109): undefined reference to `wext_proc_exit'
net/core/net-procfs.c:330:(.text+0x1e4): undefined reference to `wext_proc_init'
minimized to 48 configs; suspects: [HID_ZEROPLUS USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_DM9601 USB_NET_GL620A USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL USB_SERIAL_FTDI_SIO USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM USB_XHCI_PCI_RENESAS WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS ZEROPLUS_FF]
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing current HEAD f61a392235e085addf6e809b78c6e6114320e6e7
testing commit f61a392235e085addf6e809b78c6e6114320e6e7 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: feb6c32362fad4ec127fdfe0cf6cde831c8856af0eca93b658e0f11b3e3930cf
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
representative crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress, types: [NULL-POINTER-DEREFERENCE]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 3h31m27.115508538s (build: 25m49.654875059s, test: 1h20m5.041584999s)
crash still not fixed or there were kernel test errors
commit msg: Merge 5.10.272 into android13-5.10-lts
crash: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
erofs: (device loop2): mounted with root inode @ nid 36.
erofs: (device loop2): z_erofs_extent_lookback: bogus lookback distance @ nid 36
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 10ad52067 P4D 10ad52067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP
CPU: 1 PID: 480 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900006f3488 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ffff88810e274610 RCX: 0000000000001000
RDX: 0000000000000001 RSI: ffffc900006f3a18 RDI: ffffc900006f3508
RBP: ffffc900006f3490 R08: 0000000000000000 R09: 00000000000008c5
R10: ffffc900006f3538 R11: 0000000000001000 R12: ffffea00044cd140
R13: ffff88810e2745a0 R14: 0000000000000000 R15: ffff88811721b800
FS:  00007f63c42836c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000010effd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 z_erofs_decompress+0x11/0x20 fs/erofs/decompressor.c:360
 z_erofs_decompress_pcluster.isra.0+0x470/0x9c0 fs/erofs/zdata.c:1110
 z_erofs_decompress_queue fs/erofs/zdata.c:1188 [inline]
 z_erofs_runqueue+0x61a/0x7d0 fs/erofs/zdata.c:1515
 z_erofs_readpage+0xc0/0x1e0 fs/erofs/zdata.c:1533
 do_read_cache_page+0x263/0x400 mm/filemap.c:3197
 read_cache_page+0xd/0x10 mm/filemap.c:3296
 read_mapping_page include/linux/pagemap.h:498 [inline]
 find_target_block_classic fs/erofs/namei.c:104 [inline]
 erofs_namei+0xb6/0x620 fs/erofs/namei.c:184
 erofs_lookup fs/erofs/namei.c:228 [inline]
 erofs_lookup+0xaf/0xf0 fs/erofs/namei.c:208
 __lookup_slow+0x79/0x150 fs/namei.c:1648
 lookup_slow fs/namei.c:1665 [inline]
 walk_component+0x139/0x1b0 fs/namei.c:1960
 link_path_walk.part.0+0x219/0x340 fs/namei.c:2283
 link_path_walk fs/namei.c:2212 [inline]
 path_parentat+0x37/0x90 fs/namei.c:2487
 filename_parentat+0xb8/0x1d0 fs/namei.c:2509
 filename_create+0x40/0x160 fs/namei.c:3640
 user_path_create fs/namei.c:3715 [inline]
 do_mkdirat+0x55/0x120 fs/namei.c:3855
 __do_sys_mkdir fs/namei.c:3878 [inline]
 __se_sys_mkdir fs/namei.c:3876 [inline]
 __x64_sys_mkdir+0x16/0x20 fs/namei.c:3876
 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f63c4420e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63c4283028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f63c4699fa0 RCX: 00007f63c4420e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f63c44b6d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63c469a038 R14: 00007f63c4699fa0 R15: 00007ffe45b63e28
Modules linked in:
CR2: 0000000000000000
---[ end trace 7cd58e879e8597fc ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900006f3488 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ffff88810e274610 RCX: 0000000000001000
RDX: 0000000000000001 RSI: ffffc900006f3a18 RDI: ffffc900006f3508
RBP: ffffc900006f3490 R08: 0000000000000000 R09: 00000000000008c5
R10: ffffc900006f3538 R11: 0000000000001000 R12: ffffea00044cd140
R13: ffff88810e2745a0 R14: 0000000000000000 R15: ffff88811721b800
FS:  00007f63c42836c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000010effd000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400