ci2 starts bisection 2026-03-17 04:15:24.931333185 +0000 UTC m=+31128.097031231
bisecting fixing commit since e253c52bbdfce1f214777784549a350a8f9ba3b8
building syzkaller on d6526ea3e6ad9081c902859bbb80f9f840377cb4
ensuring issue is reproducible on original commit e253c52bbdfce1f214777784549a350a8f9ba3b8

testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 52c9a978df2aaba5ee474c9a9cafb1ab9affdf7408b6239455f6420563ad3035
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #10: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #11: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #12: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #13: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #14: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #15: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #16: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #17: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #18: crashed: BUG: unable to handle kernel NULL pointer dereference in z_erofs_decompress
run #19: 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 [locking atomic_sleep hang memleak ubsan kasan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 255bc6097fc83139e2c3b91084d6253980f9727f3058b9c8df3982bc700e02fc
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 [kasan locking atomic_sleep hang memleak ubsan], they are not needed
kconfig minimization: base=4788 full=6026 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 [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 3c2b59412505e007eafa00528e65f2e34ef4f05905e603be1296048d2272fc29
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 e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 548d5640577e1e2d3b907de06b7bed361bea1afce5206c4574544bcc936ac0eb
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 [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 7ce434fa3af41f54046bf1c48734c7a32bdfd091da171b6d0070bce8f27b468b
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 [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: f057e7d1ff267b1a1672d821bf679c9e6abe43378864ca3acf7a458854e40684
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 [memleak ubsan kasan locking atomic_sleep hang], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
failed building e253c52bbdfce1f214777784549a350a8f9ba3b8: 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 [memleak ubsan kasan locking atomic_sleep hang], they are not needed
testing current HEAD 9136079e403ad15ed26ea110e148d3555a295f84
testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 4f15db1d20759559adc3dea426902c9c67c61f91580cc91b0716332028f05cfd
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: 34m4.694007728s (build: 12m26.415213602s, test: 20m21.032327224s)
crash still not fixed or there were kernel test errors
commit msg: Revert "rpmsg: core: fix race in driver_override_show() and use core helper"
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 119536067 P4D 119536067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP
CPU: 1 PID: 455 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000072f430 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ffff88810e627598 RCX: 0000000000001000
RDX: 0000000000000001 RSI: ffffc9000072f9c0 RDI: ffffc9000072f4b0
RBP: ffffc9000072f438 R08: 0000000000000000 R09: 00000000000008c5
R10: ffffc9000072f4e0 R11: 0000000000001000 R12: ffffea00045f8280
R13: ffff88810e627528 R14: 0000000000000000 R15: ffff888114889a00
FS:  00007fec11b056c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000011484d000 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_openat+0xb3/0x10d0 fs/namei.c:3513
 do_filp_open+0x9d/0x140 fs/namei.c:3544
 do_sys_openat2+0x9c/0x210 fs/open.c:1219
 do_sys_open fs/open.c:1235 [inline]
 __do_sys_open fs/open.c:1243 [inline]
 __se_sys_open fs/open.c:1239 [inline]
 __x64_sys_open+0x52/0x90 fs/open.c:1239
 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fec11ca0ef9
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:00007fec11b05028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fec11f0bfa0 RCX: 00007fec11ca0ef9
RDX: 0000000000000000 RSI: 00000000001a1342 RDI: 0000200000000000
RBP: 00007fec11d35ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fec11f0c038 R14: 00007fec11f0bfa0 R15: 00007ffdeaf3b6e8
Modules linked in:
CR2: 0000000000000000
---[ end trace c92a2ebc16733796 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000072f430 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ffff88810e627598 RCX: 0000000000001000
RDX: 0000000000000001 RSI: ffffc9000072f9c0 RDI: ffffc9000072f4b0
RBP: ffffc9000072f438 R08: 0000000000000000 R09: 00000000000008c5
R10: ffffc9000072f4e0 R11: 0000000000001000 R12: ffffea00045f8280
R13: ffff88810e627528 R14: 0000000000000000 R15: ffff888114889a00
FS:  00007fec11b056c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000011484d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400