BUG at fs/jfs/jfs_dmap.c:3036 assert(bitno < 32)
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kernel BUG at fs/jfs/jfs_dmap.c:3036!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 8733 Comm: syz.2.309 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : dbFindBits+0x1ac/0x1b0 fs/jfs/jfs_dmap.c:3036
lr : dbFindBits+0x1ac/0x1b0 fs/jfs/jfs_dmap.c:3036
sp : ffff80009ed95fd0
x29: ffff80009ed95fd0 x28: ffff0000fdac8008 x27: 0000000000000004
x26: ffff0000fdac89c4 x25: 0000000000000071 x24: 0000000000000000
x23: ffff80008fbbd530 x22: 0000000000000020 x21: 0000000000000001
x20: 00000000ffffffff x19: 0000000000000000 x18: 1fffe000337db690
x17: ffff80008f59e000 x16: ffff800082dee3c0 x15: 0000000000000001
x14: 1ffff00013db2b74 x13: 0000000000000000 x12: 0000000000000000
x11: ffff700013db2b75 x10: 0000000000ff0100 x9 : 612358317c839400
x8 : 612358317c839400 x7 : ffff800080565bcc x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d6fd0
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000030
Call trace:
 dbFindBits+0x1ac/0x1b0 fs/jfs/jfs_dmap.c:3036 (P)
 dbAllocNear+0x1f4/0x350 fs/jfs/jfs_dmap.c:1243
 dbAlloc+0x72c/0x9dc fs/jfs/jfs_dmap.c:832
 extBalloc fs/jfs/jfs_extent.c:336 [inline]
 extAlloc+0x42c/0xdc8 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x2bc/0x8b8 fs/jfs/inode.c:254
 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2145
 block_write_begin+0xa0/0x128 fs/buffer.c:2256
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:306
 generic_perform_write+0x244/0x7bc mm/filemap.c:4254
 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4371
 generic_file_write_iter+0x10c/0x47c mm/filemap.c:4397
 __kernel_write_iter+0x310/0x738 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x3e4/0x8dc fs/coredump.c:1372
 elf_core_dump+0x29ec/0x2fbc fs/binfmt_elf.c:2111
 coredump_write+0x1084/0x1900 fs/coredump.c:1049
 vfs_coredump+0x182c/0x2354 fs/coredump.c:1170
 get_signal+0xe38/0x12f8 kernel/signal.c:3019
 arch_do_signal_or_restart+0x1c0/0x4414 arch/arm64/kernel/signal.c:1619
 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline]
 el0_da+0x174/0x230 arch/arm64/kernel/entry-common.c:541
 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:746
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: f004b1a3 91018063 52817b82 97939061 (d4210000) 
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