Extracting prog: 57.209714441s
Minimizing prog: 2m29.816961234s
Simplifying prog options: 0s
Extracting C: 1m2.171580531s
Simplifying C: 5m34.78143183s


13 programs, timeouts [15s 1m40s 6m0s]
extracting reproducer from 13 programs
single: executing 3 programs separately with timeout 15s
testing program (duration=15s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
detailed listing:
executing program 0:
r0 = syz_open_procfs$namespace(0x0, &(0x7f0000000000)='ns/pid_for_children\x00')
ioctl$NS_GET_PARENT(r0, 0x8004b707, 0x0)

program crashed: WARNING: lock held when returning to user space in ns_ioctl
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
testing program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace
detailed listing:
executing program 0:
syz_open_procfs$namespace(0x0, &(0x7f0000000000)='ns/pid_for_children\x00')

program did not crash
testing program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): ioctl$NS_GET_PARENT
detailed listing:
executing program 0:
ioctl$NS_GET_PARENT(0xffffffffffffffff, 0x8004b707, 0x0)

program did not crash
testing program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
detailed listing:
executing program 0:
r0 = syz_open_procfs$namespace(0x0, 0x0)
ioctl$NS_GET_PARENT(r0, 0x8004b707, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING in rcu_note_context_switch
simplifying C reproducer
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
testing compiled C program (duration=22.5s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_procfs$namespace-ioctl$NS_GET_PARENT
program crashed: WARNING: lock held when returning to user space in ns_ioctl
reproducing took 10m3.979708761s
repro crashed as (corrupted=false):
================================================
WARNING: lock held when returning to user space!
6.10.0-syzkaller-04472-g51835949dda3 #0 Not tainted
------------------------------------------------
syz-executor456/5192 is leaving the kernel with locks still held!
1 lock held by syz-executor456/5192:
 #0: ffffffff8dbb15e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
 #0: ffffffff8dbb15e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:839 [inline]
 #0: ffffffff8dbb15e0 (rcu_read_lock){....}-{1:2}, at: ns_ioctl+0x217/0x7b0 fs/nsfs.c:184
------------[ cut here ]------------
Voluntary context switch within RCU read-side critical section!
WARNING: CPU: 1 PID: 5192 at kernel/rcu/tree_plugin.h:330 rcu_note_context_switch+0xc5c/0x1ae0 kernel/rcu/tree_plugin.h:330
Modules linked in:
CPU: 1 PID: 5192 Comm: syz-executor456 Not tainted 6.10.0-syzkaller-04472-g51835949dda3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:rcu_note_context_switch+0xc5c/0x1ae0 kernel/rcu/tree_plugin.h:330
Code: 74 00 4c 8b 54 24 30 48 8b 44 24 28 8b 4c 24 10 e9 c6 03 00 00 c6 05 d9 91 58 0e 01 90 48 c7 c7 80 83 2e 8b e8 05 35 da ff 90 <0f> 0b 90 90 e9 a8 f4 ff ff 38 d0 7f 08 84 c0 0f 85 2b 08 00 00 80
RSP: 0000:ffffc900032d7ce8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff88806b13fbc0 RCX: ffffffff81504569
RDX: ffff888029fd4880 RSI: ffffffff81504576 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 2d2d2d2d2d2d2d2d R12: ffff888029fd4880
R13: ffff888029fd4880 R14: ffff888029fd4880 R15: ffff88806b13ec80
FS:  0000555580ebb380(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000010 CR3: 000000002777e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __schedule+0x291/0x5490 kernel/sched/core.c:6417
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6621
 exit_to_user_mode_loop kernel/entry/common.c:102 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0xe4/0x280 kernel/entry/common.c:231
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0033:0x7f1f48df7529
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef904d8b8 EFLAGS: 00000246
RAX: fffffffffffffffd RBX: 00007ffef904d8c0 RCX: 00007f1f48df7529
RDX: 0000000000000000 RSI: 000000008004b707 RDI: 0000000000000003
RBP: 00007f1f48e6a610 R08: 0000000000000000 R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffef904daf8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

final repro crashed as (corrupted=false):
================================================
WARNING: lock held when returning to user space!
6.10.0-syzkaller-04472-g51835949dda3 #0 Not tainted
------------------------------------------------
syz-executor456/5192 is leaving the kernel with locks still held!
1 lock held by syz-executor456/5192:
 #0: ffffffff8dbb15e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
 #0: ffffffff8dbb15e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:839 [inline]
 #0: ffffffff8dbb15e0 (rcu_read_lock){....}-{1:2}, at: ns_ioctl+0x217/0x7b0 fs/nsfs.c:184
------------[ cut here ]------------
Voluntary context switch within RCU read-side critical section!
WARNING: CPU: 1 PID: 5192 at kernel/rcu/tree_plugin.h:330 rcu_note_context_switch+0xc5c/0x1ae0 kernel/rcu/tree_plugin.h:330
Modules linked in:
CPU: 1 PID: 5192 Comm: syz-executor456 Not tainted 6.10.0-syzkaller-04472-g51835949dda3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:rcu_note_context_switch+0xc5c/0x1ae0 kernel/rcu/tree_plugin.h:330
Code: 74 00 4c 8b 54 24 30 48 8b 44 24 28 8b 4c 24 10 e9 c6 03 00 00 c6 05 d9 91 58 0e 01 90 48 c7 c7 80 83 2e 8b e8 05 35 da ff 90 <0f> 0b 90 90 e9 a8 f4 ff ff 38 d0 7f 08 84 c0 0f 85 2b 08 00 00 80
RSP: 0000:ffffc900032d7ce8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff88806b13fbc0 RCX: ffffffff81504569
RDX: ffff888029fd4880 RSI: ffffffff81504576 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 2d2d2d2d2d2d2d2d R12: ffff888029fd4880
R13: ffff888029fd4880 R14: ffff888029fd4880 R15: ffff88806b13ec80
FS:  0000555580ebb380(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000010 CR3: 000000002777e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __schedule+0x291/0x5490 kernel/sched/core.c:6417
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6621
 exit_to_user_mode_loop kernel/entry/common.c:102 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0xe4/0x280 kernel/entry/common.c:231
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0033:0x7f1f48df7529
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef904d8b8 EFLAGS: 00000246
RAX: fffffffffffffffd RBX: 00007ffef904d8c0 RCX: 00007f1f48df7529
RDX: 0000000000000000 RSI: 000000008004b707 RDI: 0000000000000003
RBP: 00007f1f48e6a610 R08: 0000000000000000 R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffef904daf8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>