bisecting fixing commit since d2b6f8a179194de0ffc4886ffc2c4358d86047b8
building syzkaller on bc5434be1a615eca6d901c20b026712bd9697fd4
testing commit d2b6f8a179194de0ffc4886ffc2c4358d86047b8
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: c8f1fe0f0b4bac1ea98c178b6f4fe5b3808ae15b3084c944e4d322adfdbe870e
run #0: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #1: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #2: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #3: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #4: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #5: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #6: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #7: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #8: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #9: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #10: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #11: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #12: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #13: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #14: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #15: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD 3ca706c189db861b2ca2019a0901b94050ca49d8
testing commit 3ca706c189db861b2ca2019a0901b94050ca49d8
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 735585f58c9851ac81ed43bbd6f540f1add128fdb93be445d3f581bc94daeb3d
run #0: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #1: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #2: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #3: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #4: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #5: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #6: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #7: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #8: crashed: UBSAN: shift-out-of-bounds in do_mpage_readpage
run #9: OK
revisions tested: 2, total time: 32m49.141677237s (build: 13m21.118682614s, test: 18m45.638758852s)
the crash still happens on HEAD
commit msg: drm/ttm: fix type mismatch error on sparc64
crash: UBSAN: shift-out-of-bounds in do_mpage_readpage
================================================================================
UBSAN: shift-out-of-bounds in fs/mpage.c:189:40
shift exponent 4294967279 is too large for 64-bit type 'long long unsigned int'
CPU: 0 PID: 9031 Comm: systemd-udevd Not tainted 5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 ubsan_epilogue+0x5/0x40 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds.cold+0x61/0xe9 lib/ubsan.c:330
 do_mpage_readpage.cold+0xb8/0x299 fs/mpage.c:189
 mpage_readahead+0x2c0/0x6c0 fs/mpage.c:389
 read_pages+0x1b0/0x7c0 mm/readahead.c:130
 page_cache_ra_unbounded+0x47c/0x7c0 mm/readahead.c:239
 do_page_cache_ra mm/readahead.c:269 [inline]
 force_page_cache_ra+0x301/0x560 mm/readahead.c:301
 page_cache_sync_readahead include/linux/pagemap.h:883 [inline]
 filemap_get_pages+0x253/0x1380 mm/filemap.c:2545
 filemap_read+0x28e/0xbc0 mm/filemap.c:2628
 blkdev_read_iter+0x10d/0x210 block/fops.c:544
 call_read_iter include/linux/fs.h:2157 [inline]
 new_sync_read+0x33c/0x5c0 fs/read_write.c:404
 vfs_read+0x265/0x4c0 fs/read_write.c:485
 ksys_read+0xf4/0x1d0 fs/read_write.c:623
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f90b71de210
Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24
RSP: 002b:00007ffdd9801508 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005621a989cb40 RCX: 00007f90b71de210
RDX: 0000000000000400 RSI: 00005621a989cb68 RDI: 000000000000000f
RBP: 00005621a989c460 R08: 00007f90b71c8f78 R09: 0000000000000430
R10: 000000000000006d R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000400 R14: 00005621a989c4b0 R15: 0000000000000400
================================================================================