Extracting prog: 2m51.797120858s
Minimizing prog: 1h2m13.86854467s
Simplifying prog options: 12m16.289353061s
Extracting C: 5m9.108880397s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program crashed: BUG: corrupted list in add_to_unbuddied
single: successfully extracted reproducer
found reproducer with 7 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg
detailed listing:
executing program 0:
openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r0 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r0, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, 0x0, 0x0)
r1 = accept4(r0, 0x0, 0x0, 0x0)
sendmsg$alg(r1, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
sendmsg$alg(0xffffffffffffffff, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(0xffffffffffffffff, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
bind$alg(0xffffffffffffffff, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(0xffffffffffffffff, 0x117, 0x1, 0x0, 0x0)
r1 = accept4(0xffffffffffffffff, 0x0, 0x0, 0x0)
sendmsg$alg(r1, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r1, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r0, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, 0x0, 0x0)
r1 = accept4(r0, 0x0, 0x0, 0x0)
sendmsg$alg(r1, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r1, 0xffffffffffffffff, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, 0x0, 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, 0x0, 0x0)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, 0x0, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:6 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$procfs-socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4-sendmsg$alg-sendfile
detailed listing:
executing program 0:
r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000100)='/proc/stat\x00', 0x0, 0x0)
r1 = socket$alg(0x26, 0x5, 0x0)
bind$alg(r1, &(0x7f0000000480)={0x26, 'hash\x00', 0x0, 0x0, 'hmac(sha256)\x00'}, 0x58)
setsockopt$ALG_SET_KEY(r1, 0x117, 0x1, 0x0, 0x0)
r2 = accept4(r1, 0x0, 0x0, 0x0)
sendmsg$alg(r2, &(0x7f0000000640)={0x0, 0x0, 0x0}, 0x8084)
sendfile(r2, r0, 0x0, 0x8)

program did not crash
reproducing took 1h22m31.063917145s
repro crashed as (corrupted=false):
 slab kmalloc-96 start ffff888000d37180 pointer offset 0 size 96
list_add corruption. next->prev should be prev (ffffe8ffffc380b0), but was ffffffff84ba6030. (next=ffff888000d37180).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1033 Comm: kworker/u4:5 Not tainted 6.14.0-rc6-syzkaller-00180-g83158b21ae9a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: zswap1 compact_page_work
RIP: 0010:__list_add_valid_or_report+0xf3/0x130 lib/list_debug.c:29
Code: ae 0a fd 42 80 7c 2d 00 00 74 08 48 89 df e8 44 a5 2c fd 49 8b 56 08 48 c7 c7 e0 02 81 8c 4c 89 e6 4c 89 f1 e8 1e 86 2a fc 90 <0f> 0b 4c 89 e7 e8 53 ae 0a fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 14
RSP: 0018:ffffc900024afa28 EFLAGS: 00010246
RAX: 0000000000000075 RBX: ffff888000d37188 RCX: 4c2d86e8cfe6fd00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff110001a6e31 R08: ffffffff81a1364c R09: fffffbfff1d3a69c
R10: dffffc0000000000 R11: fffffbfff1d3a69c R12: ffffe8ffffc380b0
R13: dffffc0000000000 R14: ffff888000d37180 R15: ffff888049187000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002fcc000 CR3: 0000000043522000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:88 [inline]
 __list_add include/linux/list.h:150 [inline]
 list_add include/linux/list.h:169 [inline]
 add_to_unbuddied+0x2e4/0x4d0 mm/z3fold.c:550
 do_compact_page+0x5da/0xd30 mm/z3fold.c:772
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xf3/0x130 lib/list_debug.c:29
Code: ae 0a fd 42 80 7c 2d 00 00 74 08 48 89 df e8 44 a5 2c fd 49 8b 56 08 48 c7 c7 e0 02 81 8c 4c 89 e6 4c 89 f1 e8 1e 86 2a fc 90 <0f> 0b 4c 89 e7 e8 53 ae 0a fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 14
RSP: 0018:ffffc900024afa28 EFLAGS: 00010246
RAX: 0000000000000075 RBX: ffff888000d37188 RCX: 4c2d86e8cfe6fd00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff110001a6e31 R08: ffffffff81a1364c R09: fffffbfff1d3a69c
R10: dffffc0000000000 R11: fffffbfff1d3a69c R12: ffffe8ffffc380b0
R13: dffffc0000000000 R14: ffff888000d37180 R15: ffff888049187000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002fcc000 CR3: 0000000043522000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

final repro crashed as (corrupted=false):
 slab kmalloc-96 start ffff888000d37180 pointer offset 0 size 96
list_add corruption. next->prev should be prev (ffffe8ffffc380b0), but was ffffffff84ba6030. (next=ffff888000d37180).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1033 Comm: kworker/u4:5 Not tainted 6.14.0-rc6-syzkaller-00180-g83158b21ae9a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: zswap1 compact_page_work
RIP: 0010:__list_add_valid_or_report+0xf3/0x130 lib/list_debug.c:29
Code: ae 0a fd 42 80 7c 2d 00 00 74 08 48 89 df e8 44 a5 2c fd 49 8b 56 08 48 c7 c7 e0 02 81 8c 4c 89 e6 4c 89 f1 e8 1e 86 2a fc 90 <0f> 0b 4c 89 e7 e8 53 ae 0a fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 14
RSP: 0018:ffffc900024afa28 EFLAGS: 00010246
RAX: 0000000000000075 RBX: ffff888000d37188 RCX: 4c2d86e8cfe6fd00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff110001a6e31 R08: ffffffff81a1364c R09: fffffbfff1d3a69c
R10: dffffc0000000000 R11: fffffbfff1d3a69c R12: ffffe8ffffc380b0
R13: dffffc0000000000 R14: ffff888000d37180 R15: ffff888049187000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002fcc000 CR3: 0000000043522000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:88 [inline]
 __list_add include/linux/list.h:150 [inline]
 list_add include/linux/list.h:169 [inline]
 add_to_unbuddied+0x2e4/0x4d0 mm/z3fold.c:550
 do_compact_page+0x5da/0xd30 mm/z3fold.c:772
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xf3/0x130 lib/list_debug.c:29
Code: ae 0a fd 42 80 7c 2d 00 00 74 08 48 89 df e8 44 a5 2c fd 49 8b 56 08 48 c7 c7 e0 02 81 8c 4c 89 e6 4c 89 f1 e8 1e 86 2a fc 90 <0f> 0b 4c 89 e7 e8 53 ae 0a fd 42 80 3c 2b 00 74 08 4c 89 e7 e8 14
RSP: 0018:ffffc900024afa28 EFLAGS: 00010246
RAX: 0000000000000075 RBX: ffff888000d37188 RCX: 4c2d86e8cfe6fd00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff110001a6e31 R08: ffffffff81a1364c R09: fffffbfff1d3a69c
R10: dffffc0000000000 R11: fffffbfff1d3a69c R12: ffffe8ffffc380b0
R13: dffffc0000000000 R14: ffff888000d37180 R15: ffff888049187000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c002fcc000 CR3: 0000000043522000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400