panic: kernel diagnostic assertion "ISSET(bp->b_flags, B_BC)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_bio.c", line 1683
Starting stack trace...
panic(ffffffff8295dda1) at panic+0x16f sys/kern/subr_prf.c:229
__assert(ffffffff829111d8,ffffffff828aa2db,693,ffffffff828f8f83) at __assert+0x29 sys/kern/subr_prf.c:157
bufcache_take(fffffd805d3369f8) at bufcache_take+0x254 sys/kern/vfs_bio.c:1684
getblk(fffffd80692aedc0,0,4000,0,ffffffffffffffff) at getblk+0x17e sys/kern/vfs_bio.c:1037
bread(fffffd80692aedc0,0,4000,ffff80002c31a108) at bread+0x3e bio_doread sys/kern/vfs_bio.c:430 [inline]
bread(fffffd80692aedc0,0,4000,ffff80002c31a108) at bread+0x3e sys/kern/vfs_bio.c:475
ffs2_balloc(fffffd8068d63230,0,4000,fffffd807f7d36e8,0,ffff80002c31a108) at ffs2_balloc+0x57d sys/ufs/ffs/ffs_balloc.c:478
ffs_write(ffff80002c31a190) at ffs_write+0x3c7 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80692aedc0,ffff80002c31a228,0,fffffd807f7d36e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
uvn_io(fffffd806bef7390,ffff80002c31a420,4,31,1) at uvn_io+0x38c sys/uvm/uvm_vnode.c:1269
uvn_put(fffffd806bef7390,ffff80002c31a420,4,31) at uvn_put+0xd4 sys/uvm/uvm_vnode.c:926
uvm_pager_put(fffffd806bef7390,fffffd8007164600,ffff80002c31a4b8,ffff80002c31a4f0,31,0,888c0501441c8fe2) at uvm_pager_put+0x145 sys/uvm/uvm_pager.c:545
uvn_flush(fffffd806bef7390,0,0,31) at uvn_flush+0x513 sys/uvm/uvm_vnode.c:725
uvm_vnp_sync(ffff8000006cec00) at uvm_vnp_sync+0x16e sys/uvm/uvm_vnode.c:1540
sys_sync(ffff80002a282558,ffff80002c31a6d0,ffff80002c31a620) at sys_sync+0x9b sys/kern/vfs_syscalls.c:536
syscall(ffff80002c31a6d0) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80002c31a6d0) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x92f3992b060, count: 241
End of stack trace.