Extracting prog: 1m7.42037718s
Minimizing prog: 5m30.834893326s
Simplifying prog options: 0s
Extracting C: 17.731911685s
Simplifying C: 2m24.064681079s


56 programs, 3 VMs, timeouts [15s 1m40s 6m0s]
extracting reproducer from 56 programs
single: executing 4 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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-syz_io_uring_submit-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
syz_io_uring_submit(0x0, 0x0, &(0x7f0000000280)=@IORING_OP_FALLOCATE={0x11, 0x0, 0x0, @fd_index})
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

program crashed: possible deadlock in uart_write
single: successfully extracted reproducer
found reproducer with 7 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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-syz_io_uring_submit
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
syz_io_uring_submit(0x0, 0x0, &(0x7f0000000280)=@IORING_OP_FALLOCATE={0x11, 0x0, 0x0, @fd_index})

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

program crashed: WARNING in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
ioctl$EVIOCGPROP(0xffffffffffffffff, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(0xffffffffffffffff, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r0 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r0, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r0, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
ioctl$TIOCSETD(0xffffffffffffffff, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r0 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r0, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r0, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, 0x0, 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, 0x0)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, 0x0, 0x0)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, 0x0, 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, 0x0)
write$binfmt_aout(r1, &(0x7f0000000540)=ANY=[@ANYBLOB], 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
detailed listing:
executing program 0:
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000100), 0x0, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000000c0)=0x3)
bpf$PROG_LOAD(0x5, &(0x7f0000000180)={0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0xffffffffffffffff}, 0xbb)
r1 = openat$ppp(0xffffffffffffff9c, &(0x7f0000000040), 0x1a01, 0x0)
ioctl$EVIOCGPROP(r1, 0x40047438, &(0x7f0000000180)=""/246)
write$binfmt_aout(r1, 0x0, 0xb9)

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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in console_flush_all
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
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 Repro:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$ttyS3-ioctl$TIOCSETD-bpf$PROG_LOAD-openat$ppp-ioctl$EVIOCGPROP-write$binfmt_aout
program crashed: possible deadlock in uart_write
reproducing took 9m20.051878904s
repro crashed as (corrupted=false):
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Not tainted
------------------------------------------------------
syz-executor325/5193 is trying to acquire lock:
ffffffff8dabeea0 (console_owner){-...}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1994 [inline]
ffffffff8dabeea0 (console_owner){-...}-{0:0}, at: vprintk_emit kernel/printk/printk.c:2344 [inline]
ffffffff8dabeea0 (console_owner){-...}-{0:0}, at: vprintk_emit+0x42d/0x5a0 kernel/printk/printk.c:2300

but task is already holding lock:
ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_write+0x134/0x3e0 drivers/tty/serial/serial_core.c:624

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
       serial8250_console_write+0xaa6/0x1090 drivers/tty/serial/8250/8250_port.c:3352
       console_emit_next_record kernel/printk/printk.c:2928 [inline]
       console_flush_all+0x53f/0xd70 kernel/printk/printk.c:2994
       console_unlock+0xae/0x290 kernel/printk/printk.c:3063
       vprintk_emit kernel/printk/printk.c:2345 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2370
       register_console+0xa88/0x10a0 kernel/printk/printk.c:3596
       univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:719
       console_init+0xcc/0x680 kernel/printk/printk.c:3742
       start_kernel+0x295/0x4c0 init/main.c:1038
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #0 (console_owner){-...}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       console_trylock_spinning kernel/printk/printk.c:1994 [inline]
       vprintk_emit kernel/printk/printk.c:2344 [inline]
       vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2300
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2370
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x4ac/0x580 lib/bug.c:219
       handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
       ppp_async_push+0x89e/0x1740 drivers/net/ppp/ppp_async.c:666
       ppp_async_send+0xe5/0x120 drivers/net/ppp/ppp_async.c:634
       __ppp_channel_push+0xe5/0x230 drivers/net/ppp/ppp_generic.c:2150
       ppp_channel_push+0x1c2/0x250 drivers/net/ppp/ppp_generic.c:2177
       ppp_write+0x236/0x2e0 drivers/net/ppp/ppp_generic.c:525
       vfs_write+0x29a/0x1140 fs/read_write.c:588
       ksys_write+0x12f/0x260 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&port_lock_key);
                               lock(console_owner);
                               lock(&port_lock_key);
  lock(console_owner);

 *** DEADLOCK ***

4 locks held by syz-executor325/5193:
 #0: ffff888026644248 (&pch->upl){.+..}-{2:2}, at: ppp_channel_push+0x28/0x250 drivers/net/ppp/ppp_generic.c:2171
 #1: ffff8880266441e0 (&pch->downl){+...}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #1: ffff8880266441e0 (&pch->downl){+...}-{2:2}, at: __ppp_channel_push+0x2a/0x230 drivers/net/ppp/ppp_generic.c:2146
 #2: ffff888026ab0030 (&ap->xmit_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
 #2: ffff888026ab0030 (&ap->xmit_lock){+...}-{2:2}, at: ppp_async_push+0x106/0x1740 drivers/net/ppp/ppp_async.c:659
 #3: ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
 #3: ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_write+0x134/0x3e0 drivers/tty/serial/serial_core.c:624

stack backtrace:
CPU: 3 PID: 5193 Comm: syz-executor325 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 console_trylock_spinning kernel/printk/printk.c:1994 [inline]
 vprintk_emit kernel/printk/printk.c:2344 [inline]
 vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2300
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2370
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x4ac/0x580 lib/bug.c:219
 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
Code: 6b fc e9 4e ff ff ff e8 ff 24 91 fc 90 0f 0b 90 49 c7 c4 d2 ff ff ff e9 39 ff ff ff e8 ea 24 91 fc 45 31 ff e8 e2 24 91 fc 90 <0f> 0b 90 48 85 ed 74 8c e8 d4 24 91 fc 4c 8d a5 08 01 00 00 4c 89
RSP: 0018:ffffc9000326fae8 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff88801f840be8 RCX: ffffffff816c344d
RDX: ffff888028cc4880 RSI: ffffffff84fcb00e RDI: ffff88801f840f48
RBP: ffffffff94dddf60 R08: 0000000000000001 R09: fffff5200064df4b
R10: 0000000000000003 R11: ffffffff93933af8 R12: 0000000000000001
R13: 000000000000017a R14: ffff888026ab0001 R15: 0000000000000293
 ppp_async_push+0x89e/0x1740 drivers/net/ppp/ppp_async.c:666
 ppp_async_send+0xe5/0x120 drivers/net/ppp/ppp_async.c:634
 __ppp_channel_push+0xe5/0x230 drivers/net/ppp/ppp_generic.c:2150
 ppp_channel_push+0x1c2/0x250 drivers/net/ppp/ppp_generic.c:2177
 ppp_write+0x236/0x2e0 drivers/net/ppp/ppp_generic.c:525
 vfs_write+0x29a/0x1140 fs/read_write.c:588
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e8ca324a9
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:00007ffd76a71ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd76a71ca8 RCX: 00007f7e8ca324a9
RDX: 00000000000000b9 RSI: 0000000020000540 RDI: 0000000000000004
RBP: 00007f7e8caa5610 R08: 00007ffd76a71ca8 R09: 00007ffd76a71ca8
R10: 00007ffd76a71ca8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd76a71c98 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
WARNING: CPU: 3 PID: 5193 at drivers/tty/serial/serial_core.c:625 uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
Modules linked in:
CPU: 3 PID: 5193 Comm: syz-executor325 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
Code: 6b fc e9 4e ff ff ff e8 ff 24 91 fc 90 0f 0b 90 49 c7 c4 d2 ff ff ff e9 39 ff ff ff e8 ea 24 91 fc 45 31 ff e8 e2 24 91 fc 90 <0f> 0b 90 48 85 ed 74 8c e8 d4 24 91 fc 4c 8d a5 08 01 00 00 4c 89
RSP: 0018:ffffc9000326fae8 EFLAGS: 00010093

RAX: 0000000000000000 RBX: ffff88801f840be8 RCX: ffffffff816c344d
RDX: ffff888028cc4880 RSI: ffffffff84fcb00e RDI: ffff88801f840f48
RBP: ffffffff94dddf60 R08: 0000000000000001 R09: fffff5200064df4b
R10: 0000000000000003 R11: ffffffff93933af8 R12: 0000000000000001
R13: 000000000000017a R14: ffff888026ab0001 R15: 0000000000000293
FS:  0000555585ad0380(0000) GS:ffff88806b300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 000000002f880000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ppp_async_push+0x89e/0x1740 drivers/net/ppp/ppp_async.c:666
 ppp_async_send+0xe5/0x120 drivers/net/ppp/ppp_async.c:634
 __ppp_channel_push+0xe5/0x230 drivers/net/ppp/ppp_generic.c:2150
 ppp_channel_push+0x1c2/0x250 drivers/net/ppp/ppp_generic.c:2177
 ppp_write+0x236/0x2e0 drivers/net/ppp/ppp_generic.c:525
 vfs_write+0x29a/0x1140 fs/read_write.c:588
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e8ca324a9
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:00007ffd76a71ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd76a71ca8 RCX: 00007f7e8ca324a9
RDX: 00000000000000b9 RSI: 0000000020000540 RDI: 0000000000000004
RBP: 00007f7e8caa5610 R08: 00007ffd76a71ca8 R09: 00007ffd76a71ca8
R10: 00007ffd76a71ca8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd76a71c98 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

final repro crashed as (corrupted=false):
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Not tainted
------------------------------------------------------
syz-executor325/5193 is trying to acquire lock:
ffffffff8dabeea0 (console_owner){-...}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1994 [inline]
ffffffff8dabeea0 (console_owner){-...}-{0:0}, at: vprintk_emit kernel/printk/printk.c:2344 [inline]
ffffffff8dabeea0 (console_owner){-...}-{0:0}, at: vprintk_emit+0x42d/0x5a0 kernel/printk/printk.c:2300

but task is already holding lock:
ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_write+0x134/0x3e0 drivers/tty/serial/serial_core.c:624

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
       serial8250_console_write+0xaa6/0x1090 drivers/tty/serial/8250/8250_port.c:3352
       console_emit_next_record kernel/printk/printk.c:2928 [inline]
       console_flush_all+0x53f/0xd70 kernel/printk/printk.c:2994
       console_unlock+0xae/0x290 kernel/printk/printk.c:3063
       vprintk_emit kernel/printk/printk.c:2345 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2370
       register_console+0xa88/0x10a0 kernel/printk/printk.c:3596
       univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:719
       console_init+0xcc/0x680 kernel/printk/printk.c:3742
       start_kernel+0x295/0x4c0 init/main.c:1038
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #0 (console_owner){-...}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       console_trylock_spinning kernel/printk/printk.c:1994 [inline]
       vprintk_emit kernel/printk/printk.c:2344 [inline]
       vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2300
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2370
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x4ac/0x580 lib/bug.c:219
       handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
       ppp_async_push+0x89e/0x1740 drivers/net/ppp/ppp_async.c:666
       ppp_async_send+0xe5/0x120 drivers/net/ppp/ppp_async.c:634
       __ppp_channel_push+0xe5/0x230 drivers/net/ppp/ppp_generic.c:2150
       ppp_channel_push+0x1c2/0x250 drivers/net/ppp/ppp_generic.c:2177
       ppp_write+0x236/0x2e0 drivers/net/ppp/ppp_generic.c:525
       vfs_write+0x29a/0x1140 fs/read_write.c:588
       ksys_write+0x12f/0x260 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&port_lock_key);
                               lock(console_owner);
                               lock(&port_lock_key);
  lock(console_owner);

 *** DEADLOCK ***

4 locks held by syz-executor325/5193:
 #0: ffff888026644248 (&pch->upl){.+..}-{2:2}, at: ppp_channel_push+0x28/0x250 drivers/net/ppp/ppp_generic.c:2171
 #1: ffff8880266441e0 (&pch->downl){+...}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #1: ffff8880266441e0 (&pch->downl){+...}-{2:2}, at: __ppp_channel_push+0x2a/0x230 drivers/net/ppp/ppp_generic.c:2146
 #2: ffff888026ab0030 (&ap->xmit_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
 #2: ffff888026ab0030 (&ap->xmit_lock){+...}-{2:2}, at: ppp_async_push+0x106/0x1740 drivers/net/ppp/ppp_async.c:659
 #3: ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
 #3: ffffffff94dddf78 (&port_lock_key){-.-.}-{2:2}, at: uart_write+0x134/0x3e0 drivers/tty/serial/serial_core.c:624

stack backtrace:
CPU: 3 PID: 5193 Comm: syz-executor325 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 console_trylock_spinning kernel/printk/printk.c:1994 [inline]
 vprintk_emit kernel/printk/printk.c:2344 [inline]
 vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2300
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2370
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x4ac/0x580 lib/bug.c:219
 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
Code: 6b fc e9 4e ff ff ff e8 ff 24 91 fc 90 0f 0b 90 49 c7 c4 d2 ff ff ff e9 39 ff ff ff e8 ea 24 91 fc 45 31 ff e8 e2 24 91 fc 90 <0f> 0b 90 48 85 ed 74 8c e8 d4 24 91 fc 4c 8d a5 08 01 00 00 4c 89
RSP: 0018:ffffc9000326fae8 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff88801f840be8 RCX: ffffffff816c344d
RDX: ffff888028cc4880 RSI: ffffffff84fcb00e RDI: ffff88801f840f48
RBP: ffffffff94dddf60 R08: 0000000000000001 R09: fffff5200064df4b
R10: 0000000000000003 R11: ffffffff93933af8 R12: 0000000000000001
R13: 000000000000017a R14: ffff888026ab0001 R15: 0000000000000293
 ppp_async_push+0x89e/0x1740 drivers/net/ppp/ppp_async.c:666
 ppp_async_send+0xe5/0x120 drivers/net/ppp/ppp_async.c:634
 __ppp_channel_push+0xe5/0x230 drivers/net/ppp/ppp_generic.c:2150
 ppp_channel_push+0x1c2/0x250 drivers/net/ppp/ppp_generic.c:2177
 ppp_write+0x236/0x2e0 drivers/net/ppp/ppp_generic.c:525
 vfs_write+0x29a/0x1140 fs/read_write.c:588
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e8ca324a9
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:00007ffd76a71ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd76a71ca8 RCX: 00007f7e8ca324a9
RDX: 00000000000000b9 RSI: 0000000020000540 RDI: 0000000000000004
RBP: 00007f7e8caa5610 R08: 00007ffd76a71ca8 R09: 00007ffd76a71ca8
R10: 00007ffd76a71ca8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd76a71c98 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
WARNING: CPU: 3 PID: 5193 at drivers/tty/serial/serial_core.c:625 uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
Modules linked in:
CPU: 3 PID: 5193 Comm: syz-executor325 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625
Code: 6b fc e9 4e ff ff ff e8 ff 24 91 fc 90 0f 0b 90 49 c7 c4 d2 ff ff ff e9 39 ff ff ff e8 ea 24 91 fc 45 31 ff e8 e2 24 91 fc 90 <0f> 0b 90 48 85 ed 74 8c e8 d4 24 91 fc 4c 8d a5 08 01 00 00 4c 89
RSP: 0018:ffffc9000326fae8 EFLAGS: 00010093

RAX: 0000000000000000 RBX: ffff88801f840be8 RCX: ffffffff816c344d
RDX: ffff888028cc4880 RSI: ffffffff84fcb00e RDI: ffff88801f840f48
RBP: ffffffff94dddf60 R08: 0000000000000001 R09: fffff5200064df4b
R10: 0000000000000003 R11: ffffffff93933af8 R12: 0000000000000001
R13: 000000000000017a R14: ffff888026ab0001 R15: 0000000000000293
FS:  0000555585ad0380(0000) GS:ffff88806b300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 000000002f880000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ppp_async_push+0x89e/0x1740 drivers/net/ppp/ppp_async.c:666
 ppp_async_send+0xe5/0x120 drivers/net/ppp/ppp_async.c:634
 __ppp_channel_push+0xe5/0x230 drivers/net/ppp/ppp_generic.c:2150
 ppp_channel_push+0x1c2/0x250 drivers/net/ppp/ppp_generic.c:2177
 ppp_write+0x236/0x2e0 drivers/net/ppp/ppp_generic.c:525
 vfs_write+0x29a/0x1140 fs/read_write.c:588
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e8ca324a9
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:00007ffd76a71ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffd76a71ca8 RCX: 00007f7e8ca324a9
RDX: 00000000000000b9 RSI: 0000000020000540 RDI: 0000000000000004
RBP: 00007f7e8caa5610 R08: 00007ffd76a71ca8 R09: 00007ffd76a71ca8
R10: 00007ffd76a71ca8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd76a71c98 R14: 0000000000000001 R15: 0000000000000001
 </TASK>