r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/sysvipc/shm\x00', 0x0, 0x0)
pread64(r0, &(0x7f00000004c0)=""/4096, 0x1000, 0x400)
accept(r0, &(0x7f0000000240)=@tipc, &(0x7f0000000100)=0x80)
r1 = fork()
ptrace(0x10, r1)
ptrace$setsig(0x4203, r1, 0x0, &(0x7f00000001c0)={0x1c, 0x80000000, 0x120})
r2 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/sysvipc/shm\x00', 0x0, 0x0)
ioctl$BTRFS_IOC_SYNC(r2, 0x9408, 0x0)
mremap(&(0x7f0000417000/0x1000)=nil, 0x1000, 0x4000, 0x0, &(0x7f0000416000/0x4000)=nil)