Extracting prog: 26.154723793s Minimizing prog: 6m53.491249179s Simplifying prog options: 0s Extracting C: 57.859098738s Simplifying C: 3m20.204624755s extracting reproducer from 28 programs testing a last program of every proc single: executing 6 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial single: successfully extracted reproducer found reproducer with 5 syscalls minimizing guilty program testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) accept4$alg(r0, 0x0, 0x0, 0x0) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), 0xffffffffffffffff) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: bind$alg(0xffffffffffffffff, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(0xffffffffffffffff, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r0 = accept4$alg(0xffffffffffffffff, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r0) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, 0x0, 0x0) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, 0x0, 0x0) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340), 0x0) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program did not crash testing program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(0x0, r1) program did not crash extracting C reproducer testing compiled C program (duration=31.60041651s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial simplifying C reproducer testing compiled C program (duration=31.60041651s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=31.60041651s, {Threaded:false 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$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 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:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 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:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing compiled C program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool program crashed: possible deadlock in padata_do_serial testing program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial validation run: crashed=true testing program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial validation run: crashed=true testing program (duration=31.60041651s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$alg-bind$alg-setsockopt$ALG_SET_KEY-accept4$alg-syz_genetlink_get_family_id$ethtool detailed listing: executing program 0: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'aead\x00', 0x0, 0x0, 'pcrypt(generic-gcm-aesni)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f0000000340)="71e67a15cdf0311cfcf33a52a7d86bd1", 0x20) r1 = accept4$alg(r0, 0x0, 0x0, 0x0) syz_genetlink_get_family_id$ethtool(&(0x7f00000000c0), r1) program crashed: possible deadlock in padata_do_serial validation run: crashed=true reproducing took 13m39.263881806s repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- kworker/u32:5/96 is trying to acquire lock: ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: padata_find_next kernel/padata.c:256 [inline] ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:309 [inline] ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x7bd/0xd20 kernel/padata.c:379 but task is already holding lock: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:300 [inline] ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x697/0xd20 kernel/padata.c:379 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pd_list->lock); lock(&pd_list->lock); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by kworker/u32:5/96: #0: ffff888022495148 ((wq_completion)pdecrypt_parallel){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211 #1: ffffc9000167fd10 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212 #2: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:300 [inline] #2: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x697/0xd20 kernel/padata.c:379 stack backtrace: CPU: 2 UID: 0 PID: 96 Comm: kworker/u32:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x1133/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] padata_find_next kernel/padata.c:256 [inline] padata_reorder kernel/padata.c:309 [inline] padata_do_serial+0x7bd/0xd20 kernel/padata.c:379 pcrypt_aead_dec+0x5b/0x70 crypto/pcrypt.c:140 padata_parallel_worker+0x62/0xb0 kernel/padata.c:157 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 final repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- kworker/u32:5/96 is trying to acquire lock: ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: padata_find_next kernel/padata.c:256 [inline] ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:309 [inline] ffffe8fefc53dbc8 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x7bd/0xd20 kernel/padata.c:379 but task is already holding lock: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:300 [inline] ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x697/0xd20 kernel/padata.c:379 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pd_list->lock); lock(&pd_list->lock); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by kworker/u32:5/96: #0: ffff888022495148 ((wq_completion)pdecrypt_parallel){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211 #1: ffffc9000167fd10 ((work_completion)(&pw->pw_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212 #2: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_reorder kernel/padata.c:300 [inline] #2: ffffe8fefc53dc18 (&pd_list->lock){+...}-{3:3}, at: padata_do_serial+0x697/0xd20 kernel/padata.c:379 stack backtrace: CPU: 2 UID: 0 PID: 96 Comm: kworker/u32:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x1133/0x1ce0 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] padata_find_next kernel/padata.c:256 [inline] padata_reorder kernel/padata.c:309 [inline] padata_do_serial+0x7bd/0xd20 kernel/padata.c:379 pcrypt_aead_dec+0x5b/0x70 crypto/pcrypt.c:140 padata_parallel_worker+0x62/0xb0 kernel/padata.c:157 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:463 ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245