Extracting prog: 1m55.260278256s Minimizing prog: 11m21.324367915s Simplifying prog options: 0s Extracting C: 1m3.202247902s Simplifying C: 15m44.965371731s 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:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH-bpf$BPF_PROG_TEST_RUN detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) bpf$BPF_PROG_TEST_RUN(0xa, 0x0, 0x0) program crashed: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple program crashed: BUG: corrupted list in flow_block_cb_setup_simple single: successfully extracted reproducer found reproducer with 4 syscalls minimizing guilty program testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: sendmsg$NFT_BATCH(0xffffffffffffffff, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(0xffffffffffffffff, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, 0x0, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={0x0, 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, 0x0, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={0x0, 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program did not crash extracting C reproducer testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple simplifying C reproducer testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple a never seen crash title: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program did not crash testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program did not crash testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program did not crash testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program did not crash testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false 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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program did not crash testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple a never seen crash title: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: unable to handle kernel paging request in flow_block_cb_setup_simple a never seen crash title: BUG: unable to handle kernel paging request in flow_block_cb_setup_simple, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program did not crash testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple a never seen crash title: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:false Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:false Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH program crashed: BUG: corrupted list in flow_block_cb_setup_simple testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:false Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program crashed: BUG: corrupted list in flow_block_cb_setup_simple validation run: crashed=true testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:false Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program crashed: BUG: corrupted list in flow_block_cb_setup_simple validation run: crashed=true testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:false Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_netfilter-sendmsg$NFT_BATCH-sendmsg$NFT_BATCH detailed listing: executing program 0: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f000000c2c0)={0x0, 0x0, &(0x7f000000c280)={&(0x7f0000000600)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a01010000000000000000050000000900010073797a300000000064000000030a01030000000000000000050000000900010073797a30000000000900030073797a300000000008000a40000000032800048008000240000000120800014000000000140003006e657464657673696d30000000000000080000000000000014000000110001"], 0xac}, 0x1, 0x0, 0x0, 0x4008855}, 0x0) sendmsg$NFT_BATCH(r0, &(0x7f0000000cc0)={0x0, 0x0, &(0x7f0000000ac0)={&(0x7f0000000bc0)=ANY=[@ANYBLOB="14000000100001f500000000000000000100000a14000000020a497f75241d4e1deb00000500000614000000110001"], 0x3c}, 0x1, 0x0, 0x0, 0x2004c040}, 0xc050) program crashed: KASAN: slab-use-after-free Read in flow_block_cb_setup_simple validation run: crashed=true reproducing took 33m20.801878786s repro crashed as (corrupted=false): ================================================================== BUG: KASAN: slab-use-after-free in flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x1b0/0x6ac net/core/flow_offload.c:351 Read of size 8 at addr ffff0000c3781c20 by task syz.0.175/5282 CPU: 0 UID: 0 PID: 5282 Comm: syz.0.175 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] flow_block_cb_setup_simple+0x1b0/0x6ac net/core/flow_offload.c:351 nsim_setup_tc+0xe0/0x238 drivers/net/netdevsim/tc.c:87 nft_block_offload_cmd net/netfilter/nf_tables_offload.c:397 [inline] nft_chain_offload_cmd+0x1c0/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Allocated by task 5279: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] flow_block_cb_alloc net/core/flow_offload.c:265 [inline] flow_block_cb_setup_simple+0x27c/0x6ac net/core/flow_offload.c:354 nsim_setup_tc+0xe0/0x238 drivers/net/netdevsim/tc.c:87 nft_block_offload_cmd net/netfilter/nf_tables_offload.c:397 [inline] nft_chain_offload_cmd+0x1c0/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Freed by task 5279: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kfree+0x188/0x658 mm/slub.c:6802 flow_block_cb_free+0x78/0x8c net/core/flow_offload.c:283 nft_flow_offload_unbind+0x2dc/0x36c net/netfilter/nf_tables_offload.c:344 nft_block_setup net/netfilter/nf_tables_offload.c:361 [inline] nft_block_offload_cmd net/netfilter/nf_tables_offload.c:401 [inline] nft_chain_offload_cmd+0x1e8/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 The buggy address belongs to the object at ffff0000c3781c00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff0000c3781c00, ffff0000c3781cc0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000c3781300 pfn:0x103781 flags: 0x5ffc00000000200(workingset|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000200 ffff0000c00013c0 fffffdffc317d1d0 fffffdffc30d52d0 raw: ffff0000c3781300 000000000010000f 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c3781b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c3781b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff0000c3781c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c3781c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff0000c3781d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Unable to handle kernel paging request at virtual address dfff800000000004 KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 [dfff800000000004] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 5282 Comm: syz.0.175 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] pc : flow_block_cb_setup_simple+0x1a0/0x6ac net/core/flow_offload.c:351 lr : flow_block_cb_is_busy net/core/flow_offload.c:325 [inline] lr : flow_block_cb_setup_simple+0x210/0x6ac net/core/flow_offload.c:351 sp : ffff800097386860 x29: ffff800097386860 x28: dfff800000000000 x27: 1fffe00019c4a801 x26: 0000000000000020 x25: dfff800000000000 x24: ffff0000ce254ec0 x23: 0000000000000000 x22: ffff80008301bf30 x21: ffff0000ce254ec0 x20: ffff800097386ad0 x19: ffff80008a268b60 x18: 000000004ac0ee02 x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d x14: 00000000000007d4 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff7000115f6121 x9 : 0000000000000000 x8 : 0000000000000004 x7 : 0000000000000000 x6 : ffff800080482944 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000020 x2 : 0000000000000000 x1 : ffff0000ee0f3b00 x0 : 0000000000000000 Call trace: flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] (P) flow_block_cb_setup_simple+0x1a0/0x6ac net/core/flow_offload.c:351 (P) nsim_setup_tc+0xe0/0x238 drivers/net/netdevsim/tc.c:87 nft_block_offload_cmd net/netfilter/nf_tables_offload.c:397 [inline] nft_chain_offload_cmd+0x1c0/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Code: eb1302ff 54000580 910082fa d343ff48 (38796908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eb1302ff cmp x23, x19 4: 54000580 b.eq 0xb4 // b.none 8: 910082fa add x26, x23, #0x20 c: d343ff48 lsr x8, x26, #3 * 10: 38796908 ldrb w8, [x8, x25] <-- trapping instruction final repro crashed as (corrupted=false): ================================================================== BUG: KASAN: slab-use-after-free in flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x1b0/0x6ac net/core/flow_offload.c:351 Read of size 8 at addr ffff0000c3781c20 by task syz.0.175/5282 CPU: 0 UID: 0 PID: 5282 Comm: syz.0.175 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] flow_block_cb_setup_simple+0x1b0/0x6ac net/core/flow_offload.c:351 nsim_setup_tc+0xe0/0x238 drivers/net/netdevsim/tc.c:87 nft_block_offload_cmd net/netfilter/nf_tables_offload.c:397 [inline] nft_chain_offload_cmd+0x1c0/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Allocated by task 5279: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] flow_block_cb_alloc net/core/flow_offload.c:265 [inline] flow_block_cb_setup_simple+0x27c/0x6ac net/core/flow_offload.c:354 nsim_setup_tc+0xe0/0x238 drivers/net/netdevsim/tc.c:87 nft_block_offload_cmd net/netfilter/nf_tables_offload.c:397 [inline] nft_chain_offload_cmd+0x1c0/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Freed by task 5279: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kfree+0x188/0x658 mm/slub.c:6802 flow_block_cb_free+0x78/0x8c net/core/flow_offload.c:283 nft_flow_offload_unbind+0x2dc/0x36c net/netfilter/nf_tables_offload.c:344 nft_block_setup net/netfilter/nf_tables_offload.c:361 [inline] nft_block_offload_cmd net/netfilter/nf_tables_offload.c:401 [inline] nft_chain_offload_cmd+0x1e8/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 The buggy address belongs to the object at ffff0000c3781c00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff0000c3781c00, ffff0000c3781cc0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000c3781300 pfn:0x103781 flags: 0x5ffc00000000200(workingset|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000200 ffff0000c00013c0 fffffdffc317d1d0 fffffdffc30d52d0 raw: ffff0000c3781300 000000000010000f 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c3781b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c3781b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff0000c3781c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c3781c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff0000c3781d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Unable to handle kernel paging request at virtual address dfff800000000004 KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 [dfff800000000004] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 5282 Comm: syz.0.175 Tainted: G B syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] pc : flow_block_cb_setup_simple+0x1a0/0x6ac net/core/flow_offload.c:351 lr : flow_block_cb_is_busy net/core/flow_offload.c:325 [inline] lr : flow_block_cb_setup_simple+0x210/0x6ac net/core/flow_offload.c:351 sp : ffff800097386860 x29: ffff800097386860 x28: dfff800000000000 x27: 1fffe00019c4a801 x26: 0000000000000020 x25: dfff800000000000 x24: ffff0000ce254ec0 x23: 0000000000000000 x22: ffff80008301bf30 x21: ffff0000ce254ec0 x20: ffff800097386ad0 x19: ffff80008a268b60 x18: 000000004ac0ee02 x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d x14: 00000000000007d4 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff7000115f6121 x9 : 0000000000000000 x8 : 0000000000000004 x7 : 0000000000000000 x6 : ffff800080482944 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000020 x2 : 0000000000000000 x1 : ffff0000ee0f3b00 x0 : 0000000000000000 Call trace: flow_block_cb_is_busy net/core/flow_offload.c:326 [inline] (P) flow_block_cb_setup_simple+0x1a0/0x6ac net/core/flow_offload.c:351 (P) nsim_setup_tc+0xe0/0x238 drivers/net/netdevsim/tc.c:87 nft_block_offload_cmd net/netfilter/nf_tables_offload.c:397 [inline] nft_chain_offload_cmd+0x1c0/0x494 net/netfilter/nf_tables_offload.c:451 nft_flow_block_chain+0xfc/0x2c8 net/netfilter/nf_tables_offload.c:471 nft_flow_offload_chain net/netfilter/nf_tables_offload.c:513 [inline] nft_flow_rule_offload_commit+0x450/0xae0 net/netfilter/nf_tables_offload.c:-1 nf_tables_commit+0xc74/0x6b20 net/netfilter/nf_tables_api.c:11006 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0xfb0/0x16ec net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Code: eb1302ff 54000580 910082fa d343ff48 (38796908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eb1302ff cmp x23, x19 4: 54000580 b.eq 0xb4 // b.none 8: 910082fa add x26, x23, #0x20 c: d343ff48 lsr x8, x26, #3 * 10: 38796908 ldrb w8, [x8, x25] <-- trapping instruction